The program shows pictures on the screen for the current position
and the position just before the last call. Normally, those pictures
will not appear in the sequence written to a file. If you want the
current position to have its picture written in a file (say, because the
sequence is very difficult and you believe it may be necessary to say
something helpful then like "check a parallelogram with boys in the center
box") select the command keep picture.
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