There appears to be an subtle issue with all Labs (that I've tested)
when run from the Gtk IDE.
If you just advance through the labs everything is fine. However if
you experiment in the IDE by entering and executing one or more lines
of J and then advance the lab, the first executed line of the next
section is not displayed.

For example:
1) Start the Gtk IDE
2) Help|Studio|Labs
3) Choose the "A Taste of J (1)" lab
4) Use Ctrl+j to advance to section (2 of 32)
5) Follow the lab instructions to experiment
6) Use Ctrl+j to advance to section (3 of 32)

The first 2 lines after the commentary are:

15 25 35

If instead you do steps 2-6 but omit 5 the first 2 lines after the
commentary are:
   5 + 10 20 30
15 25 35


The above is just an example but all sections of all labs that I've
tested seem to be affected.

I've identified this issue in the Gtk IDE on both Linux and Windows.
It seems to be fine in the JHS IDE. Obviously this can be quite
confusing for new J users!!
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