Programming puzzles: processing lists!

[pier4r]

While reading the general forum (page 41 now) I discovered this post: http://www.hpmuseum.org/forum/thread-4496.html

Inside a member pointed to the one minute marvels that contains interesting list operations. Also there is a version for duplicates.

Also the one minute marvel mentions handouts about Hp 48 periodical learning sessions. Were those, by chance, uploaded somewhere? Would be nice to have a look at them.

Also, thanks for the solutions about the #21 I will confront with mine asap