Programming puzzles: processing lists!

[pier4r]

@Dave Britten: nice, I may join you since my ti 89 lays unused (but I would also like to find for it a more suitable role. Moreover if I use to many things at once I cannot have time for newRPL, there is a wiki to fill and source code to read).

@John Keith. Thanks for the info. I thought it was always faster or very similar to the basic built in procedures.