Multimap<String, Integer> multimap = ImmutableSetMultimap.copyOf(input);
    assertEquals(multimap, input);
    assertEquals(input, multimap);
  }

  public void testCopyOfImmutableSetMultimap() {
    Multimap<String, Integer> multimap = createMultimap();
    assertThat(ImmutableSetMultimap.copyOf(multimap)).isSameInstanceAs(multimap);
  }

  public void testCopyOfNullKey() {

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