puzzles for student presentations

procedures with variable length argument lists

find out from the R4RS manual how to write a procedurethat can take a variable number of arguments
make up an entertaining procedure that exploits this feature

define a procedure that takes a list and returns a list ofall the sublists
for example, (p (list 1 2 3)) should return a list containing()(1)(2)(3)(1 2)(1 3)(2 3)(1 2 3)in some order
use map!