Divide and conquer. 1. Rename node numbers in each file from $n to $Filename.$n (during input processing).
2. Set union of PRED_NODE lists of same-key nodes. 3. Rename nodes arbitrarily again, & remove duplicates from merged lists; possibly with a Topological Sort to make it less arbitrary. -- Bill @n1vux bill.n1...@gmail.com _______________________________________________ Boston-pm mailing list Boston-pm@mail.pm.org http://mail.pm.org/mailman/listinfo/boston-pm