@Override
  public @Nullable V put(@ParametricNullness K key, @ParametricNullness V value) {
    return putInBothMaps(key, value, false);
  }

  @CanIgnoreReturnValue
  @Override
  public @Nullable V forcePut(@ParametricNullness K key, @ParametricNullness V value) {
    return putInBothMaps(key, value, true);
  }

  private @Nullable V putInBothMaps(

    setSucceeds(lastInInsertionOrder, size);
    setSucceeds(size, ENDPOINT);
    size++;
    modCount++;
    return null;
  }

  @CanIgnoreReturnValue
  @Override
  public @Nullable V forcePut(@ParametricNullness K key, @ParametricNullness V value) {
    return put(key, value, true);
  }

  @CanIgnoreReturnValue
  private @Nullable K putInverse(

  @Override
  public @Nullable V put(@ParametricNullness K key, @ParametricNullness V value) {
    return putInBothMaps(key, value, false);
  }

  @CanIgnoreReturnValue
  @Override
  public @Nullable V forcePut(@ParametricNullness K key, @ParametricNullness V value) {
    return putInBothMaps(key, value, true);
  }

  private @Nullable V putInBothMaps(

    }

    BiMap<K, V> unfiltered() {
      return (BiMap<K, V>) unfiltered;
    }

    @Override
    public @Nullable V forcePut(@ParametricNullness K key, @ParametricNullness V value) {
      checkArgument(apply(key, value));
      return unfiltered().forcePut(key, value);
    }

    @Override
    public BiMap<V, K> inverse() {
      return inverse;
    }

    @Override

    }

    BiMap<K, V> unfiltered() {
      return (BiMap<K, V>) unfiltered;
    }

    @Override
    public @Nullable V forcePut(@ParametricNullness K key, @ParametricNullness V value) {
      checkArgument(apply(key, value));
      return unfiltered().forcePut(key, value);
    }

    @Override
    public void replaceAll(BiFunction<? super K, ? super V, ? extends V> function) {
      unfiltered()

   * @deprecated Unsupported operation.
   */
  @CanIgnoreReturnValue
  @Deprecated
  @Override
  @DoNotCall("Always throws UnsupportedOperationException")
  public final @Nullable V forcePut(K key, V value) {
    throw new UnsupportedOperationException();
  }

  /**
   * Serialized type for all ImmutableBiMap instances. It captures the logical contents and they are

        }
        return valueSet;
      }
    }

    @Override
    public @Nullable V forcePut(@ParametricNullness K key, @ParametricNullness V value) {
      synchronized (mutex) {
        return delegate().forcePut(key, value);
      }
    }

    @Override
    public BiMap<V, K> inverse() {
      synchronized (mutex) {

        }
        return valueSet;
      }
    }

    @Override
    public @Nullable V forcePut(@ParametricNullness K key, @ParametricNullness V value) {
      synchronized (mutex) {
        return delegate().forcePut(key, value);
      }
    }

    @Override
    public BiMap<V, K> inverse() {
      synchronized (mutex) {

   * @deprecated Unsupported operation.
   */
  @CanIgnoreReturnValue
  @Deprecated
  @Override
  @DoNotCall("Always throws UnsupportedOperationException")
  public final @Nullable V forcePut(K key, V value) {
    throw new UnsupportedOperationException();
  }

  /**
   * Serialized type for all ImmutableBiMap instances. It captures the logical contents and they are

  @SuppressWarnings("DoNotCall")
  public void testForcePut() {
    BiMap<String, Integer> bimap = ImmutableBiMap.copyOf(ImmutableMap.of("one", 1, "two", 2));
    assertThrows(UnsupportedOperationException.class, () -> bimap.forcePut("three", 3));
  }

  public void testKeySet() {
    ImmutableBiMap<String, Integer> bimap =
        ImmutableBiMap.copyOf(ImmutableMap.of("one", 1, "two", 2, "three", 3, "four", 4));