public boolean contains(@Nullable Object rowKey, @Nullable Object columnKey) {
    return containsRow(rowKey) && containsColumn(columnKey);
  }

  /**
   * Returns {@code true} if the provided column key is among the column keys provided when the
   * table was constructed.
   */
  @Override
  public boolean containsColumn(@Nullable Object columnKey) {
    return columnKeyToIndex.containsKey(columnKey);
  }

  /**

  public boolean contains(@Nullable Object rowKey, @Nullable Object columnKey) {
    return containsRow(rowKey) && containsColumn(columnKey);
  }

  /**
   * Returns {@code true} if the provided column key is among the column keys provided when the
   * table was constructed.
   */
  @Override
  public boolean containsColumn(@Nullable Object columnKey) {
    return columnKeyToIndex.containsKey(columnKey);
  }

  /**

  /**
   * Returns {@code true} if the table contains a mapping with the specified column.
   *
   * @param columnKey key of column to search for
   */
  boolean containsColumn(@CompatibleWith("C") @Nullable Object columnKey);

  /**
   * Returns {@code true} if the table contains a mapping with the specified value.
   *
   * @param value value to search for
   */

  /**
   * Returns {@code true} if the table contains a mapping with the specified column.
   *
   * @param columnKey key of column to search for
   */
  boolean containsColumn(@CompatibleWith("C") @Nullable Object columnKey);

  /**
   * Returns {@code true} if the table contains a mapping with the specified value.
   *
   * @param value value to search for
   */

      return original.contains(columnKey, rowKey);
    }

    @Override
    public boolean containsColumn(@Nullable Object columnKey) {
      return original.containsRow(columnKey);
    }

    @Override
    public boolean containsRow(@Nullable Object rowKey) {
      return original.containsColumn(rowKey);
    }

    @Override
    public boolean containsValue(@Nullable Object value) {

      return original.contains(columnKey, rowKey);
    }

    @Override
    public boolean containsColumn(@Nullable Object columnKey) {
      return original.containsRow(columnKey);
    }

    @Override
    public boolean containsRow(@Nullable Object rowKey) {
      return original.containsColumn(rowKey);
    }

    @Override
    public boolean containsValue(@Nullable Object value) {

      synchronized (mutex) {
        return delegate().containsRow(rowKey);
      }
    }

    @Override
    public boolean containsColumn(@Nullable Object columnKey) {
      synchronized (mutex) {
        return delegate().containsColumn(columnKey);
      }
    }

    @Override
    public boolean containsValue(@Nullable Object value) {
      synchronized (mutex) {

      synchronized (mutex) {
        return delegate().containsRow(rowKey);
      }
    }

    @Override
    public boolean containsColumn(@Nullable Object columnKey) {
      synchronized (mutex) {
        return delegate().containsColumn(columnKey);
      }
    }

    @Override
    public boolean containsValue(@Nullable Object value) {
      synchronized (mutex) {

  }

  public void testContainsColumn() {
    table = create("foo", 1, 'a', "bar", 1, 'b', "foo", 3, 'c');
    assertTrue(table.containsColumn(1));
    assertTrue(table.containsColumn(3));
    assertFalse(table.containsColumn(2));
    assertFalse(table.containsColumn(null));
  }

  public void testContainsValue() {
    table = create("foo", 1, 'a', "bar", 1, 'b', "foo", 3, 'c');

  }

  public void testContainsColumn() {
    for (ImmutableTable<Character, Integer, String> testInstance : getTestInstances()) {
      assertTrue(testInstance.containsColumn(1));
      assertTrue(testInstance.containsColumn(2));
      assertFalse(testInstance.containsColumn(3));
    }
  }

  public void testContainsRow() {
    for (ImmutableTable<Character, Integer, String> testInstance : getTestInstances()) {