–next_perm: I have an iterative solution
–next perm 5C3: iterative algo, growing global collection
–next_combo 5C3: I have a (approx) 10-line recursive algo. (Iterative algo is non-ideal). Passing in two collections.
–next_abbreviation of any length: I have a (approx) 10-line recursive algo. Using global collection, this algo is simpler than next_combo
–So far, these algos are decent but have nothing in common.