static <A, B> MultiMap<B, A> reversedMapToMultiMap(Map<A, B> map) {
  ret reversedMapAsMultiMap(map);
}





static <A, B> MultiMap<B, A> reversedMapToMultiMap(Map<A, B> map, MultiMap<B, A> mm) {
  ret reversedMapAsMultiMap(map, mm);
}