gbranden pushed a commit to branch master
in repository groff.
commit 837153d7e4d849ab13d2485cd3a4bd88a5c9c06f
Author: G. Branden Robinson <[email protected]>
AuthorDate: Thu Dec 18 20:24:32 2025 -0600
[chem]: Rationalize copyright licensing (3/3).
I'm alarmed at the assertion of an FSF copyright over these examples
when they're explicitly identified as originating elsewhere, in Bell
Labs CSTR #122. _If_ any copyright inhered in these descriptions of
molecular structures, wouldn't it have been Bell Labs'?
However, I am dubious that copyright _could_ inhere in them. Most of
these are descriptions of simple molecules; many are short one-liners.
One can argue about how much room the chem language offers for
originality and expression. One would have a better argument if these
examples were annotated with substantial, creative prose. They are not.
I retain acknowledgement of Bernd as making corrections to two files.
I have restrained myself from editorializing, but I feel that Bernd
needed much closer supervision, or more active mentoring, than he got.
---
contrib/chem/examples/122/ch2a_ethyl.chem | 25 ---------------------
contrib/chem/examples/122/ch2b_benzene.chem | 25 ---------------------
contrib/chem/examples/122/ch2c_benzene_right.chem | 21 -----------------
contrib/chem/examples/122/ch4a_stick.chem | 25 ---------------------
contrib/chem/examples/122/ch4b_methyl_acetate.chem | 25 ---------------------
contrib/chem/examples/122/ch4c_colon.chem | 25 ---------------------
contrib/chem/examples/122/ch4d_HCl.H2O.chem | 25 ---------------------
contrib/chem/examples/122/ch4e_CaSO4.2H2O.chem | 25 ---------------------
contrib/chem/examples/122/ch4f_C.chem | 26 ----------------------
contrib/chem/examples/122/ch4g_BP.chem | 25 ---------------------
contrib/chem/examples/122/ch4h_methacrylate.chem | 25 ---------------------
contrib/chem/examples/122/ch4i_cyclo.chem | 26 ----------------------
contrib/chem/examples/122/ch4j_ring4.chem | 25 ---------------------
contrib/chem/examples/122/ch4k_ring3.chem | 25 ---------------------
contrib/chem/examples/122/ch4l_vertex.chem | 25 ---------------------
contrib/chem/examples/122/ch4m_double.chem | 25 ---------------------
contrib/chem/examples/122/ch4n_triple.chem | 25 ---------------------
contrib/chem/examples/122/ch4o_aromatic.chem | 21 -----------------
contrib/chem/examples/122/ch4p_cholestanol.chem | 25 ---------------------
contrib/chem/examples/122/ch4q_rings.chem | 25 ---------------------
contrib/chem/examples/122/ch4r_spiro.chem | 25 ---------------------
contrib/chem/examples/122/ch4s_heteroatoms.chem | 25 ---------------------
contrib/chem/examples/122/ch4t_polycyclic.chem | 25 ---------------------
contrib/chem/examples/122/ch4u_nicotine.chem | 26 ----------------------
contrib/chem/examples/122/ch4v_histidine.chem | 25 ---------------------
contrib/chem/examples/122/ch4w_lsd.chem | 25 ---------------------
contrib/chem/examples/122/ch4x_anisole.chem | 25 ---------------------
contrib/chem/examples/122/ch4y_reserpine.chem | 26 +---------------------
contrib/chem/examples/122/ch4z1_eqn_glutamic.chem | 26 +---------------------
contrib/chem/examples/122/ch4z2_text.chem | 25 ---------------------
contrib/chem/examples/122/ch5a_size.chem | 25 ---------------------
contrib/chem/examples/122/ch6a_pic.chem | 25 ---------------------
contrib/chem/examples/122/ch6b_dna.chem | 25 ---------------------
contrib/chem/examples/122/chAa_polymer.chem | 25 ---------------------
contrib/chem/examples/122/chAb_vinyl_chloro.chem | 25 ---------------------
contrib/chem/examples/122/chAc_morphine.chem | 26 ----------------------
contrib/chem/examples/122/chAd_chlorophyll.chem | 25 ---------------------
contrib/chem/examples/122/chAe_chair.chem | 25 ---------------------
contrib/chem/examples/122/chAf_arrow.chem | 25 ---------------------
contrib/chem/examples/122/chAg_circle.chem | 25 ---------------------
contrib/chem/examples/122/chAh_brackets.chem | 25 ---------------------
.../examples/122/chAi_poly_vinyl_chloride.chem | 25 ---------------------
contrib/chem/examples/122/chBa_jump.chem | 26 ----------------------
contrib/chem/examples/122/chBb_bonds.chem | 25 ---------------------
contrib/chem/examples/122/chBc_rings.chem | 25 ---------------------
45 files changed, 2 insertions(+), 1122 deletions(-)
diff --git a/contrib/chem/examples/122/ch2a_ethyl.chem
b/contrib/chem/examples/122/ch2a_ethyl.chem
index 1953c7933..4697e0e15 100644
--- a/contrib/chem/examples/122/ch2a_ethyl.chem
+++ b/contrib/chem/examples/122/ch2a_ethyl.chem
@@ -2,36 +2,11 @@ ch2a_ethyl.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
CH3
bond
CH2
diff --git a/contrib/chem/examples/122/ch2b_benzene.chem
b/contrib/chem/examples/122/ch2b_benzene.chem
index 700df5b56..7c532aaa1 100644
--- a/contrib/chem/examples/122/ch2b_benzene.chem
+++ b/contrib/chem/examples/122/ch2b_benzene.chem
@@ -2,36 +2,11 @@ ch2b_benzene.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
benzene
# Local Variables:
diff --git a/contrib/chem/examples/122/ch2c_benzene_right.chem
b/contrib/chem/examples/122/ch2c_benzene_right.chem
index 64b6d8852..c12ebddc6 100644
--- a/contrib/chem/examples/122/ch2c_benzene_right.chem
+++ b/contrib/chem/examples/122/ch2c_benzene_right.chem
@@ -2,32 +2,11 @@ ch2c_benzene_right.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
benzene pointing right # a rotated benzene ring
# Local Variables:
diff --git a/contrib/chem/examples/122/ch4a_stick.chem
b/contrib/chem/examples/122/ch4a_stick.chem
index 2ef52896b..a6dad7ed7 100644
--- a/contrib/chem/examples/122/ch4a_stick.chem
+++ b/contrib/chem/examples/122/ch4a_stick.chem
@@ -2,36 +2,11 @@ ch4a_stick.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
bond right
bond 60
bond 120
diff --git a/contrib/chem/examples/122/ch4b_methyl_acetate.chem
b/contrib/chem/examples/122/ch4b_methyl_acetate.chem
index 130bb1357..2fd62391c 100644
--- a/contrib/chem/examples/122/ch4b_methyl_acetate.chem
+++ b/contrib/chem/examples/122/ch4b_methyl_acetate.chem
@@ -2,36 +2,11 @@ ch4b_methyl_acetate.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
CH3 # the 3 is automatically turned into a subscript
bond # the implicit direction is right
# implicit connection is to right side of CH3
diff --git a/contrib/chem/examples/122/ch4c_colon.chem
b/contrib/chem/examples/122/ch4c_colon.chem
index 9cfe1262f..83b13089c 100644
--- a/contrib/chem/examples/122/ch4c_colon.chem
+++ b/contrib/chem/examples/122/ch4c_colon.chem
@@ -2,36 +2,11 @@ ch4c_colon.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
CH3
bond ; C
double bond 30 ; O
diff --git a/contrib/chem/examples/122/ch4d_HCl.H2O.chem
b/contrib/chem/examples/122/ch4d_HCl.H2O.chem
index 848e86b84..02d3fd427 100644
--- a/contrib/chem/examples/122/ch4d_HCl.H2O.chem
+++ b/contrib/chem/examples/122/ch4d_HCl.H2O.chem
@@ -2,36 +2,11 @@ ch4d_HCl.H2O.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
HCl.H2O
# Local Variables:
diff --git a/contrib/chem/examples/122/ch4e_CaSO4.2H2O.chem
b/contrib/chem/examples/122/ch4e_CaSO4.2H2O.chem
index fbbac3ea2..78ab33c21 100644
--- a/contrib/chem/examples/122/ch4e_CaSO4.2H2O.chem
+++ b/contrib/chem/examples/122/ch4e_CaSO4.2H2O.chem
@@ -2,36 +2,11 @@ ch4e_CaSO4.2H2O.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
CaSO4.2H2O
# Local Variables:
diff --git a/contrib/chem/examples/122/ch4f_C.chem
b/contrib/chem/examples/122/ch4f_C.chem
index 987395543..62e2c7088 100644
--- a/contrib/chem/examples/122/ch4f_C.chem
+++ b/contrib/chem/examples/122/ch4f_C.chem
@@ -2,36 +2,11 @@ ch4f_C.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
bond ; C # 1st definition of C
bond up from C
bond down from C
@@ -43,7 +18,6 @@ ch4f_C.chem:
bond down from C
bond right from C
-
# Local Variables:
# mode: Nroff
# End:
diff --git a/contrib/chem/examples/122/ch4g_BP.chem
b/contrib/chem/examples/122/ch4g_BP.chem
index b2a9f604c..5a388df5d 100644
--- a/contrib/chem/examples/122/ch4g_BP.chem
+++ b/contrib/chem/examples/122/ch4g_BP.chem
@@ -2,36 +2,11 @@ ch4g_BP.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
# this is the isopropyl group
bond 120 ; BP # BP is right end of this bond
bond -120 from BP
diff --git a/contrib/chem/examples/122/ch4h_methacrylate.chem
b/contrib/chem/examples/122/ch4h_methacrylate.chem
index 43f32e5cc..f7ceaf08a 100644
--- a/contrib/chem/examples/122/ch4h_methacrylate.chem
+++ b/contrib/chem/examples/122/ch4h_methacrylate.chem
@@ -2,36 +2,11 @@ ch4h_methacrylate.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
bond dotted
bond right ; BP
bond up from BP ; C
diff --git a/contrib/chem/examples/122/ch4i_cyclo.chem
b/contrib/chem/examples/122/ch4i_cyclo.chem
index 26e35e64a..319ad5255 100644
--- a/contrib/chem/examples/122/ch4i_cyclo.chem
+++ b/contrib/chem/examples/122/ch4i_cyclo.chem
@@ -2,36 +2,11 @@ ch4i_cyclo.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
R3: ring3
R4: ring4 at R3 + (.75,0)
R5: ring5 at R4 + (.75,0)
@@ -40,7 +15,6 @@ B: benzene at R6 + (.75,0)
R7: ring7 at B + (.75,0)
R8: ring8 at R7 + (.75,0)
-
# Local Variables:
# mode: Nroff
# End:
diff --git a/contrib/chem/examples/122/ch4j_ring4.chem
b/contrib/chem/examples/122/ch4j_ring4.chem
index b2ab21b23..2c96fbd2e 100644
--- a/contrib/chem/examples/122/ch4j_ring4.chem
+++ b/contrib/chem/examples/122/ch4j_ring4.chem
@@ -2,36 +2,11 @@ ch4j_ring4.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
ring4 pointing 45
# Local Variables:
diff --git a/contrib/chem/examples/122/ch4k_ring3.chem
b/contrib/chem/examples/122/ch4k_ring3.chem
index 42a1474ce..27ac818c4 100644
--- a/contrib/chem/examples/122/ch4k_ring3.chem
+++ b/contrib/chem/examples/122/ch4k_ring3.chem
@@ -2,36 +2,11 @@ ch4k_ring3.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
R: ring3
back bond 120 from R.V2 ; C2H5
front bond -120 from R.V3 ; HO
diff --git a/contrib/chem/examples/122/ch4l_vertex.chem
b/contrib/chem/examples/122/ch4l_vertex.chem
index aad1ea08b..2d2d5da5a 100644
--- a/contrib/chem/examples/122/ch4l_vertex.chem
+++ b/contrib/chem/examples/122/ch4l_vertex.chem
@@ -2,36 +2,11 @@ ch4l_vertex.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
R: benzene pointing right
bond left from R.V4 ; HO
bond -150 from R.V3 ; CH3O
diff --git a/contrib/chem/examples/122/ch4m_double.chem
b/contrib/chem/examples/122/ch4m_double.chem
index db1a659dd..c06fb6850 100644
--- a/contrib/chem/examples/122/ch4m_double.chem
+++ b/contrib/chem/examples/122/ch4m_double.chem
@@ -2,36 +2,11 @@ ch4m_double.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
ring double 1,2 3,4 5,6
# Local Variables:
diff --git a/contrib/chem/examples/122/ch4n_triple.chem
b/contrib/chem/examples/122/ch4n_triple.chem
index ecf2a969c..ae4ef7300 100644
--- a/contrib/chem/examples/122/ch4n_triple.chem
+++ b/contrib/chem/examples/122/ch4n_triple.chem
@@ -2,36 +2,11 @@ ch4n_triple.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
ring8 triple 3,4
# Local Variables:
diff --git a/contrib/chem/examples/122/ch4o_aromatic.chem
b/contrib/chem/examples/122/ch4o_aromatic.chem
index 18a5fa5a1..17c3f090a 100644
--- a/contrib/chem/examples/122/ch4o_aromatic.chem
+++ b/contrib/chem/examples/122/ch4o_aromatic.chem
@@ -2,32 +2,11 @@ ch4o_aromatic.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
R: aromatic ring7
"+" at R
diff --git a/contrib/chem/examples/122/ch4p_cholestanol.chem
b/contrib/chem/examples/122/ch4p_cholestanol.chem
index 4f99357c9..c62ce3674 100644
--- a/contrib/chem/examples/122/ch4p_cholestanol.chem
+++ b/contrib/chem/examples/122/ch4p_cholestanol.chem
@@ -2,36 +2,11 @@ ch4p_cholestanol.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
R1: ring6
"R1" at R1 # this puts a label at R1
front bond -120 from R1.V5 ; HO
diff --git a/contrib/chem/examples/122/ch4q_rings.chem
b/contrib/chem/examples/122/ch4q_rings.chem
index c6145d2a3..501b3d850 100644
--- a/contrib/chem/examples/122/ch4q_rings.chem
+++ b/contrib/chem/examples/122/ch4q_rings.chem
@@ -2,36 +2,11 @@ ch4q_rings.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
R3: ring3
R4: ring4 pointing 45 with .V1 at R3.V2
R5: ring5 pointing down with .V4 at R4.V2
diff --git a/contrib/chem/examples/122/ch4r_spiro.chem
b/contrib/chem/examples/122/ch4r_spiro.chem
index c0fb40854..370170a5c 100644
--- a/contrib/chem/examples/122/ch4r_spiro.chem
+++ b/contrib/chem/examples/122/ch4r_spiro.chem
@@ -2,36 +2,11 @@ ch4r_spiro.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
R1: ring6
R2: ring6 with .V1 at R1.V4
R3: ring5 with .V5 at R2.V3
diff --git a/contrib/chem/examples/122/ch4s_heteroatoms.chem
b/contrib/chem/examples/122/ch4s_heteroatoms.chem
index 31d860b9f..bc802b550 100644
--- a/contrib/chem/examples/122/ch4s_heteroatoms.chem
+++ b/contrib/chem/examples/122/ch4s_heteroatoms.chem
@@ -2,36 +2,11 @@ ch4s_heteroatoms.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
ring put N at 2 put S at 4 double 2,3 4,5 6,1
# Local Variables:
diff --git a/contrib/chem/examples/122/ch4t_polycyclic.chem
b/contrib/chem/examples/122/ch4t_polycyclic.chem
index 8408f6f40..55d6e5a7e 100644
--- a/contrib/chem/examples/122/ch4t_polycyclic.chem
+++ b/contrib/chem/examples/122/ch4t_polycyclic.chem
@@ -2,36 +2,11 @@ ch4t_polycyclic.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
R1: benzene pointing right
bond 30 from R1.V6 ; Br
R2: benzene pointing right with .V5 at R1.V1
diff --git a/contrib/chem/examples/122/ch4u_nicotine.chem
b/contrib/chem/examples/122/ch4u_nicotine.chem
index d1ac4ab7d..62f8d0913 100644
--- a/contrib/chem/examples/122/ch4u_nicotine.chem
+++ b/contrib/chem/examples/122/ch4u_nicotine.chem
@@ -2,42 +2,16 @@ ch4u_nicotine.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
benzene put N at 4
bond right
ring5 pointing down put N at 1
bond down from .N ; CH3 # or .V1
-
# Local Variables:
# mode: Nroff
# End:
diff --git a/contrib/chem/examples/122/ch4v_histidine.chem
b/contrib/chem/examples/122/ch4v_histidine.chem
index 0f7e1083b..dd64a363c 100644
--- a/contrib/chem/examples/122/ch4v_histidine.chem
+++ b/contrib/chem/examples/122/ch4v_histidine.chem
@@ -2,36 +2,11 @@ ch4v_histidine.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
R1: flatring pointing down put N at 2 put N at 5 double 1,2 3,4
H right of R1.V5
bond right from R1.V4 ; CH2
diff --git a/contrib/chem/examples/122/ch4w_lsd.chem
b/contrib/chem/examples/122/ch4w_lsd.chem
index 4e23b7595..6ce6c46a1 100644
--- a/contrib/chem/examples/122/ch4w_lsd.chem
+++ b/contrib/chem/examples/122/ch4w_lsd.chem
@@ -2,36 +2,11 @@ ch4w_lsd.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
B: benzene pointing right
F: flatring pointing left put N at 5 double 3,4 with .V1 at B.V2
H below F.N
diff --git a/contrib/chem/examples/122/ch4x_anisole.chem
b/contrib/chem/examples/122/ch4x_anisole.chem
index 06a47425e..cfa1efa3b 100644
--- a/contrib/chem/examples/122/ch4x_anisole.chem
+++ b/contrib/chem/examples/122/ch4x_anisole.chem
@@ -2,36 +2,11 @@ ch4x_anisole.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
R1: benzene
bond down from R1.V4 ; OCH3
R2: benzene at R1 + (1.5,0)
diff --git a/contrib/chem/examples/122/ch4y_reserpine.chem
b/contrib/chem/examples/122/ch4y_reserpine.chem
index 95909afdf..b132c5687 100644
--- a/contrib/chem/examples/122/ch4y_reserpine.chem
+++ b/contrib/chem/examples/122/ch4y_reserpine.chem
@@ -2,36 +2,12 @@ ch4y_reserpine.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Some corrections were added.
-
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
+# Corrections by Bernd Warken, 2006.
CH3O
bond 60
diff --git a/contrib/chem/examples/122/ch4z1_eqn_glutamic.chem
b/contrib/chem/examples/122/ch4z1_eqn_glutamic.chem
index 1fcebb46d..c1db19da0 100644
--- a/contrib/chem/examples/122/ch4z1_eqn_glutamic.chem
+++ b/contrib/chem/examples/122/ch4z1_eqn_glutamic.chem
@@ -5,36 +5,12 @@ delim $$
.EN
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Some corrections were added.
-
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
+# Corrections by Bernd Warken, 2006.
# a left bracket
bond right length .1 ; BP
diff --git a/contrib/chem/examples/122/ch4z2_text.chem
b/contrib/chem/examples/122/ch4z2_text.chem
index d243dc6bc..6bcc8cf50 100644
--- a/contrib/chem/examples/122/ch4z2_text.chem
+++ b/contrib/chem/examples/122/ch4z2_text.chem
@@ -2,36 +2,11 @@ ch4z2_text.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
bond 120 dotted
bond 120 length .3 ; BP
back bond -120 length .25 from BP ; H
diff --git a/contrib/chem/examples/122/ch5a_size.chem
b/contrib/chem/examples/122/ch5a_size.chem
index 7a748049d..41d86d6a8 100644
--- a/contrib/chem/examples/122/ch5a_size.chem
+++ b/contrib/chem/examples/122/ch5a_size.chem
@@ -2,36 +2,11 @@ ch5a_size.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
.ps 14
size 16
R: ring6 put O at 1 put C at 2 put O at 3 put C at 4 put O at 5 put C at 6
diff --git a/contrib/chem/examples/122/ch6a_pic.chem
b/contrib/chem/examples/122/ch6a_pic.chem
index e55a181f1..58eadb91e 100644
--- a/contrib/chem/examples/122/ch6a_pic.chem
+++ b/contrib/chem/examples/122/ch6a_pic.chem
@@ -2,36 +2,11 @@ ch6a_pic.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
R: ring double 2,3
line from R.V6 to R.C
line from R.C to R.V4
diff --git a/contrib/chem/examples/122/ch6b_dna.chem
b/contrib/chem/examples/122/ch6b_dna.chem
index 68ef343fc..96feb501f 100644
--- a/contrib/chem/examples/122/ch6b_dna.chem
+++ b/contrib/chem/examples/122/ch6b_dna.chem
@@ -2,36 +2,11 @@ ch6b_dna.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
P: [
R1: flatring pointing up put N at 1 put N at 4 double 5,1
bond -135 from R1.V4 ; BP
diff --git a/contrib/chem/examples/122/chAa_polymer.chem
b/contrib/chem/examples/122/chAa_polymer.chem
index 5a53f2e99..6303d20be 100644
--- a/contrib/chem/examples/122/chAa_polymer.chem
+++ b/contrib/chem/examples/122/chAa_polymer.chem
@@ -2,36 +2,11 @@ chAa_polymer.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
# epoxy based on the m-phenyldiamine cured bisphenol-A
size 8
bond dotted
diff --git a/contrib/chem/examples/122/chAb_vinyl_chloro.chem
b/contrib/chem/examples/122/chAb_vinyl_chloro.chem
index 3c8d866c5..8a85db90c 100644
--- a/contrib/chem/examples/122/chAb_vinyl_chloro.chem
+++ b/contrib/chem/examples/122/chAb_vinyl_chloro.chem
@@ -2,36 +2,11 @@ chAb_vinyl_chloro.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
Cl
bond 120 length .25 ; BP
bond 60 length .25 from BP ; Cl
diff --git a/contrib/chem/examples/122/chAc_morphine.chem
b/contrib/chem/examples/122/chAc_morphine.chem
index 603c15caf..8a15503f0 100644
--- a/contrib/chem/examples/122/chAc_morphine.chem
+++ b/contrib/chem/examples/122/chAc_morphine.chem
@@ -2,36 +2,11 @@ chAc_morphine.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
R1: ring6 double 1,2
bond -60 from R1.V6 ; HO
R2: ring6 with .V1 at R1.V3
@@ -47,7 +22,6 @@ R3: benzene with .V1 at R2.V5
B1: bond up length .33 from R1.V4
bond to BP
-
# Local Variables:
# mode: Nroff
# End:
diff --git a/contrib/chem/examples/122/chAd_chlorophyll.chem
b/contrib/chem/examples/122/chAd_chlorophyll.chem
index 5abc99061..10474e62b 100644
--- a/contrib/chem/examples/122/chAd_chlorophyll.chem
+++ b/contrib/chem/examples/122/chAd_chlorophyll.chem
@@ -2,36 +2,11 @@ chAd_chlorophyll.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
Mg
bond 45 ; N
R1: ring5 pointing up put N at 4 double 1,2 4,5 with .V4 at N
diff --git a/contrib/chem/examples/122/chAe_chair.chem
b/contrib/chem/examples/122/chAe_chair.chem
index fb29f002a..dd2f4fef7 100644
--- a/contrib/chem/examples/122/chAe_chair.chem
+++ b/contrib/chem/examples/122/chAe_chair.chem
@@ -2,36 +2,11 @@ chAe_chair.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
pic define chair { [
V1: bond 120 length .25
V2: bond right length .35
diff --git a/contrib/chem/examples/122/chAf_arrow.chem
b/contrib/chem/examples/122/chAf_arrow.chem
index fa646ab5c..00c437b00 100644
--- a/contrib/chem/examples/122/chAf_arrow.chem
+++ b/contrib/chem/examples/122/chAf_arrow.chem
@@ -5,36 +5,11 @@ delim $$
.EN
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
bond length .1 ; BP
bond up length .5
bond right
diff --git a/contrib/chem/examples/122/chAg_circle.chem
b/contrib/chem/examples/122/chAg_circle.chem
index 7c588642c..edb5b440c 100644
--- a/contrib/chem/examples/122/chAg_circle.chem
+++ b/contrib/chem/examples/122/chAg_circle.chem
@@ -2,36 +2,11 @@ chAg_circle.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
bond 120 ; C
bond 60 ; C
bond up ; Cl
diff --git a/contrib/chem/examples/122/chAh_brackets.chem
b/contrib/chem/examples/122/chAh_brackets.chem
index a13b70841..9592dddd8 100644
--- a/contrib/chem/examples/122/chAh_brackets.chem
+++ b/contrib/chem/examples/122/chAh_brackets.chem
@@ -5,36 +5,11 @@ delim $$
.EN
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
[
bond right ; CH2
bond 120 ; (CH2)
diff --git a/contrib/chem/examples/122/chAi_poly_vinyl_chloride.chem
b/contrib/chem/examples/122/chAi_poly_vinyl_chloride.chem
index a0a4d1c07..24b5898bc 100644
--- a/contrib/chem/examples/122/chAi_poly_vinyl_chloride.chem
+++ b/contrib/chem/examples/122/chAi_poly_vinyl_chloride.chem
@@ -3,36 +3,11 @@ chAi_poly_vinyl_chloride.chem:
.ps -2
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
db = .12
cwid = .095
A: [
diff --git a/contrib/chem/examples/122/chBa_jump.chem
b/contrib/chem/examples/122/chBa_jump.chem
index 70a57db01..c8dc08046 100644
--- a/contrib/chem/examples/122/chBa_jump.chem
+++ b/contrib/chem/examples/122/chBa_jump.chem
@@ -2,41 +2,15 @@ chBa_jump.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
SiO2 # name = SiO2
move right 1
CH3CH2NH2.HCl # name = CH3CH2NH2HCl
-
# Local Variables:
# mode: Nroff
# End:
diff --git a/contrib/chem/examples/122/chBb_bonds.chem
b/contrib/chem/examples/122/chBb_bonds.chem
index 1bded1dee..1dedd04c6 100644
--- a/contrib/chem/examples/122/chBb_bonds.chem
+++ b/contrib/chem/examples/122/chBb_bonds.chem
@@ -2,36 +2,11 @@ chBb_bonds.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
C
frontbond -170 from C ; H
backbond 10 from C ; CO2H
diff --git a/contrib/chem/examples/122/chBc_rings.chem
b/contrib/chem/examples/122/chBc_rings.chem
index 5649c1e8a..ecb759c3e 100644
--- a/contrib/chem/examples/122/chBc_rings.chem
+++ b/contrib/chem/examples/122/chBc_rings.chem
@@ -2,36 +2,11 @@ chBc_rings.chem:
.br
.cstart
-# Example file for chem:
-
# This originates from Computing Science Technical Report No. 122
# CHEM - A Program for Typesetting Chemical Diagrams: User Manual
# by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
# <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
-# Copyright (C) 2006-2020 Free Software Foundation, Inc.
-
-# This file is part of chem.
-#
-# chem is distributed with groff, the GNU roff typesetting system.
-
-# groff is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License (GPL) version 2 as
-# published by the Free Software Foundation.
-
-# groff is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# The GPL2 license text is available in the internet at
-# <http://www.gnu.org/licenses/gpl-2.0.html>.
-
-########################################################################
-
R1: benzene
bond -120 from R1.V5 ; CH3O
R2: ring4 pointing 45 with .V4 at R1.V2
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