private static <T, U> void addToMap(@NotNull Map<T, U> map, @NotNull Collection<? extends T> keys, U value) {
    for (T key : keys) {
      map.put(key, value);
    }
  }
private static <T, U> void addToMap(@NotNull Map<T, U> map, @NotNull Collection<? extends T> keys, U value)