return forward.lower(e);
    }

    @Override
    @CheckForNull
    public E pollFirst() {
      return forward.pollLast();
    }

    @Override
    @CheckForNull
    public E pollLast() {
      return forward.pollFirst();
    }

    @Override
    public NavigableSet<E> descendingSet() {
      return forward;
    }

    }
    try {
      unmod.pollFirst();
      fail("UnsupportedOperationException expected");
    } catch (UnsupportedOperationException expected) {
    }
    try {
      unmod.pollLast();
      fail("UnsupportedOperationException expected");
    } catch (UnsupportedOperationException expected) {
    }
    try {
      Iterator<Integer> iterator = unmod.iterator();
      iterator.next();

   */
  @CanIgnoreReturnValue
  @Deprecated
  @GwtIncompatible // NavigableSet
  @Override
  @DoNotCall("Always throws UnsupportedOperationException")
  @CheckForNull
  public final E pollLast() {
    throw new UnsupportedOperationException();
  }

  @GwtIncompatible // NavigableSet
  @LazyInit
  @CheckForNull
  transient ImmutableSortedSet<E> descendingSet;

  /** @since 12.0 */

   */
  @CanIgnoreReturnValue
  @Deprecated
  @GwtIncompatible // NavigableSet
  @Override
  @DoNotCall("Always throws UnsupportedOperationException")
  @CheckForNull
  public final E pollLast() {
    throw new UnsupportedOperationException();
  }

  @GwtIncompatible // NavigableSet
  @LazyInit
  @CheckForNull
  transient ImmutableSortedSet<E> descendingSet;

  /** @since 12.0 */

    }

    @Override
    @CheckForNull
    public K pollFirst() {
      return keyOrNull(map().pollFirstEntry());
    }

    @Override
    @CheckForNull
    public K pollLast() {
      return keyOrNull(map().pollLastEntry());
    }

    @Override
    public NavigableSet<K> descendingSet() {
      return map().descendingKeySet();
    }

    @Override

    }

    @Override
    @CheckForNull
    public K pollFirst() {
      return keyOrNull(map().pollFirstEntry());
    }

    @Override
    @CheckForNull
    public K pollLast() {
      return keyOrNull(map().pollLastEntry());
    }

    @Override
    public NavigableSet<K> descendingSet() {
      return map().descendingKeySet();
    }

    @Override

    font-weight:bold;
}
td.colFirst, th.colFirst {
    border-left:1px solid #9eadc0;
    white-space:nowrap;
}
td.colLast, th.colLast {
    border-right:1px solid #9eadc0;
}