return Ordering.from(comparator).immutableSortedCopy((Iterable<@NonNull E>) getDelegate());
  }

  /**
   * Returns an {@code ImmutableSet} containing all of the elements from this fluent iterable with
   * duplicates removed.
   *
   * <p><b>{@code Stream} equivalent:</b> pass {@link ImmutableSet#toImmutableSet} to {@code
   * stream.collect()}.
   *
   * @throws NullPointerException if any element is {@code null}

   * @param columnKeys column keys that may be stored in the generated table
   * @throws NullPointerException if any of the provided keys is null
   * @throws IllegalArgumentException if {@code rowKeys} or {@code columnKeys} contains duplicates
   *     or if exactly one of {@code rowKeys} or {@code columnKeys} is empty.
   */
  public static <R, C, V> ArrayTable<R, C, V> create(
      Iterable<? extends R> rowKeys, Iterable<? extends C> columnKeys) {

   * update the underlying table, and vice versa.
   *
   * @return set of column keys
   */
  Set<C> columnKeySet();

  /**
   * Returns a collection of all values, which may contain duplicates. Changes to the returned
   * collection will update the underlying table, and vice versa.
   *
   * @return collection of values
   */
  Collection<V> values();

  /**

   with its <<<DefaultModelValidator>>> implementation
   ({{{./xref/org/apache/maven/model/validation/DefaultModelValidator.html}source}})

   ** model normalization - merge duplicates: <<<ModelNormalizer>>> ({{{./apidocs/org/apache/maven/model/normalization/ModelNormalizer.html}javadoc}}),
   with its <<<DefaultModelNormalizer>>> implementation

            lifecycle.allPhases().forEach(phase -> {
                if (!set.add(phase.name())) {
                    throw new IllegalArgumentException(
                            "Found duplicated phase '" + phase.name() + "' in '" + lifecycle.id() + "' lifecycle");
                }
            });
        }
    }

    @Override
    public Iterator<Lifecycle> iterator() {

   * update the underlying table, and vice versa.
   *
   * @return set of column keys
   */
  Set<C> columnKeySet();

  /**
   * Returns a collection of all values, which may contain duplicates. Changes to the returned
   * collection will update the underlying table, and vice versa.
   *
   * @return collection of values
   */
  Collection<V> values();

  /**

        SuggestItem.Kind[] result = SuggestItem.concatKinds(kinds1, kinds2);

        assertNotNull(result);
        assertEquals(2, result.length); // Should not have duplicates
        assertTrue(Arrays.asList(result).contains(SuggestItem.Kind.QUERY));
        assertTrue(Arrays.asList(result).contains(SuggestItem.Kind.DOCUMENT));
    }

    @Test
    public void testEmptySource() {

   * input is not modified. The returned list is serializable and has random access.
   *
   * <p>Unlike {@link Sets#newTreeSet(Iterable)}, this method does not discard elements that are
   * duplicates according to the comparator. The sort performed is <i>stable</i>, meaning that such
   * elements will appear in the returned list in the same order they appeared in {@code elements}.
   *

   * order. The sorting algorithm used is stable, so elements that compare as equal will stay in the
   * order in which they appear in the input.
   *
   * <p>If your data has no duplicates, or you wish to deduplicate elements, use {@code
   * ImmutableSortedSet.copyOf(elements)}; if you want a {@code List} you can use its {@code
   * asList()} view.
   *

                    merged.put(key, element);
                }
            }

            target.setPluginRepositories(new ArrayList<>(merged.values()));
        }
    }

    /*
     * TODO: Whether duplicates should be removed looks like an option for the generated merger.
     */
    @Override
    protected void mergeBuildBase_Filters(