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static ItIt> allPartialMappings(Cl l1, Cl l2) { L _l1 = asList(l1), _l2 = asList(l2); ret (ItIt) nestedI(allSubsetsOfLength(l(l1), _l2), subset -> mapI(allPermutations(subset), perm -> zipTwoListsToOrderedMap(_l1, perm))); }