[racket] Challenge Questions

Hello all,

Just wondering if anyone is interested in submitted some challenge
questions for my HtDP-based course. We're currently about to write our
exams (couple of weeks) and it would be great to have some problems to work
on. We've been following HtDP quite closely and have just finished covered
graphs in class - any suggestions would be greatly appreciated. The
questions should be challenging but not impossible and no higher than the
Intermediate Student with Lambda level.

Thanks!

Mark
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