I don't know about powerset(), but challenge 3 was pretty trivial using Python's itertools module: http://gist.github.com/617663 http://gist.github.com/617663 (

I don't know about powerset(), but challenge 3 was pretty trivial using Python's itertools module: http://gist.github.com/617663 http://gist.github.com/617663 (warning: spoilers)