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static > ItIt> outerProduct_faster(L lists) { ret mapI fromSimplyLinkedList(outerProduct_faster(toSimplyLinkedList(lists))); } static > ItIt> outerProduct_faster(SimplyLinkedList lists) { if (lists == null) ret singletonIterator(null); L lists2 = dropFirst(lists); ret nestedIterator(lists.head, func(A a) -> Iterator> { mapI(outerProduct_faster(lists.tail), l -> SimplyLinkedList.cons(a, l)) }); }