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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);
SimplyLinkedList lists2 = lists.tail;
ret nestedIterator(lists.head, func(A a) -> Iterator> {
mapI(outerProduct_faster(lists2), l -> SimplyLinkedList.cons(a, l))
});
}