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// f must return a list static L concatMap(O f, Iterable l) { ret concatLists(map(f, l)); } static L concatMap(Iterable l, O f) { ret concatMap(f, l); } static L concatMap(O f, O[] l) { ret concatLists(map(f, l)); } static L concatMap(O[] l, O f) { ret concatMap(f, l); } static > L concatMap(Iterable l, IF1 f) { ret concatMap(l, (O) f); }