return delegateCollection().comparator();
  }

  // Override indexOf() and lastIndexOf() to be O(log N) instead of O(N).

  @GwtIncompatible // ImmutableSortedSet.indexOf
  // TODO(cpovirk): consider manual binary search under GWT to preserve O(log N) lookup
  @Override
  public int indexOf(@CheckForNull Object target) {
    int index = delegateCollection().indexOf(target);

                if (userAgent != null) {
                    if (userAgent.indexOf("MSIE") >= 0 || userAgent.indexOf("Trident") >= 0) {
                        uaType = UserAgentType.IE;
                    } else if (userAgent.indexOf("Firefox") >= 0) {
                        uaType = UserAgentType.FIREFOX;
                    } else if (userAgent.indexOf("Chrome") >= 0) {
                        uaType = UserAgentType.CHROME;

            (K k, V v) -> {
              int index = keys().asList().indexOf(k);
              return values().asList().get(index + 1);
            });
    List<Entry<K, V>> expectedEntries = new ArrayList<>();
    for (Entry<K, V> entry : getSampleEntries()) {
      int index = keys().asList().indexOf(entry.getKey());
      expectedEntries.add(Helpers.mapEntry(entry.getKey(), values().asList().get(index + 1)));
    }

            int indexOf = field.indexOf(':');
            if (indexOf < 0)
                return new Pair<>(field, null);
            final String indexField = indexOf == 0 ? defaultField : field.substring(0, indexOf);
            final String extensionKey = field.substring(indexOf + 1);
            return new Pair<>(indexField, extensionKey);
        }
    }

  ForwardingImmutableList() {}

  abstract List<E> delegateList();

  public int indexOf(@Nullable Object object) {
    return delegateList().indexOf(object);
  }

  public int lastIndexOf(@Nullable Object object) {
    return delegateList().lastIndexOf(object);
  }

  public E get(int index) {
    return delegateList().get(index);
  }

  public ImmutableList<E> subList(int fromIndex, int toIndex) {

        String result = original;

        // Unquote
        if (result.indexOf('\"') >= 0) {
            final Matcher m = QUOTE_REPLACE_PATTERN.matcher(original);
            if (m.matches()) {
                result = m.group(1);
            }

            // Unescape
            if (result.indexOf(ESCAPED_QUOTE) >= 0) {
                result = result.replace(ESCAPED_QUOTE, "\"");
            }

  @Override
  public void add(int index, @ParametricNullness E element) {
    delegate().add(index, element);
  }

  @CanIgnoreReturnValue
  @Override
  public boolean addAll(int index, Collection<? extends E> elements) {
    return delegate().addAll(index, elements);
  }

  @Override
  @ParametricNullness
  public E get(int index) {
    return delegate().get(index);
  }

  @Override

    }
    this.axesSizeProduct = axesSizeProduct;
  }

  private int getAxisIndexForProductIndex(int index, int axis) {
    return (index / axesSizeProduct[axis + 1]) % axes.get(axis).size();
  }

  @Override
  public int indexOf(@CheckForNull Object o) {
    if (!(o instanceof List)) {
      return -1;
    }
    List<?> list = (List<?>) o;
    if (list.size() != axes.size()) {

        list.addLast("1");
        list.addLast("2");
        list.addLast("3");
        assertThat(list.indexOf(null), is(0));
        assertThat(list.indexOf("1"), is(1));
        assertThat(list.indexOf("2"), is(2));
        assertThat(list.indexOf("3"), is(3));
        assertThat(list.indexOf("4"), is(-1));
    }

  @Override
  public void add(int index, @ParametricNullness E element) {
    delegate().add(index, element);
  }

  @CanIgnoreReturnValue
  @Override
  public boolean addAll(int index, Collection<? extends E> elements) {
    return delegate().addAll(index, elements);
  }

  @Override
  @ParametricNullness
  public E get(int index) {
    return delegate().get(index);
  }

  @Override