Am 23.02.2016 um 14:02 schrieb Henrique Andrade:
Dear Jack and Allin,

Thanks a lot for your invaluable advices! I really couldn't figure out
these solutions and code improvements by myself.

Let me pick up this old thread: Would it make sense to integrate such a reasonably optimized powerset function into the extra.gfn package? (which is now an addon)