All these Maple files for permutation puzzles
are released under the GPL and copyright 
David Joyner, 2008 (though they were
written much earlier - I'm not sure when).

I'm not sure if they work anymore but email
wdjoyner@gmail.com if you have questions.
I don't have a working copy of Maple, so please
be sure to include full details if you are having 
any problems.