Algorithm::Loops - Looping constructs: NestedLoops, MapCar*, Filter, and NextPermute* Algorithm::Loops provides several functions for doing different types of looping constructs: Filter Similar to C but designed for use with s/// and other reflexive operations. Returns a modified copy of a list. MapCar, MapCarU, MapCarE, and MapCarMin All similar to C but loop over multiple lists at the same time. NextPermute and NextPermuteNum Efficiently find all (unique) permutations of a list, even if it contains duplicate values. NestedLoops Simulate C loops nested arbitrarily deep.