* {@code get(null)}, {@code keySet().contains(null)} or {@code remove(null)}.
   */
  ALLOWS_NULL_KEY_QUERIES,
  ALLOWS_NULL_KEYS(ALLOWS_NULL_KEY_QUERIES),
  /**
   * The map does not throw {@code NullPointerException} on calls such as {@code
   * containsValue(null)}, {@code values().contains(null)} or {@code values().remove(null)}.
   */
  ALLOWS_NULL_VALUE_QUERIES,
  ALLOWS_NULL_VALUES(ALLOWS_NULL_VALUE_QUERIES),

$TMP_DOWNLOAD_DIR = New-Item -Itemtype Directory -Path "$TMP_DOWNLOAD_DIR_HOLDER.dir"
$TMP_DOWNLOAD_DIR_HOLDER.Delete() | Out-Null
trap {
  if ($TMP_DOWNLOAD_DIR.Exists) {
    try { Remove-Item $TMP_DOWNLOAD_DIR -Recurse -Force | Out-Null }
    catch { Write-Warning "Cannot remove $TMP_DOWNLOAD_DIR" }
  }
}

New-Item -Itemtype Directory -Path "$MAVEN_HOME_PARENT" -Force | Out-Null

# Download and Install Apache Maven

        if (cycle != null) {
            // remove edge which introduced cycle
            removeEdge(from, to);
            throw new CycleDetectedException(
                    "Edge between '" + from.label + "' and '" + to.label + "' introduces to cycle in the graph", cycle);
        }
    }

    void removeEdge(Vertex from, Vertex to) {
        from.children.remove(to);
        to.parents.remove(from);
    }

                    entity.put(fessConfig.getIndexFieldId(), newId);
                    entity.remove(fessConfig.getIndexFieldVersion());
                    final Number seqNo = (Number) entity.remove(fessConfig.getIndexFieldSeqNo());
                    final Number primaryTerm = (Number) entity.remove(fessConfig.getIndexFieldPrimaryTerm());
                    if (seqNo != null && primaryTerm != null && oldId != null) {

			"object0",
			[]string{"object1"},
		},
		// Test 2: remove an object inside a directory and checks it is deleted
		// with its parent since this former becomes empty
		{
			"bucket2",
			[]objectUpload{{"object0", "content"}, {"dir/object1", "content"}},
			"dir/object1",
			[]string{"object0"},
		},
		// Test 3: remove an object inside a directory and checks if it is deleted

    assertEquals(asList("5", "2", "3", "4", "6"), toList);
    fromList.remove(Integer.valueOf(2));
    assertEquals(asList("5", "3", "4", "6"), toList);
    fromList.remove(2);
    assertEquals(asList("5", "3", "6"), toList);

    /* toList modifications reflected in fromList */
    toList.remove(2);
    assertEquals(asList(5, 3), fromList);
    toList.remove("5");
    assertEquals(asList(3), fromList);
    toList.clear();

        return delegate().iterator();
      }

      @Override
      public int size() {
        return delegate().size();
      }

      @Override
      public boolean remove(Object o) {
        return delegate().remove(o);
      }

      @Override
      public void clear() {
        delegate().clear();
      }
    };
  }

  @Override
  public @Nullable Entry<K, V> firstEntry() {

    throw new UnsupportedOperationException();
  }

  @CanIgnoreReturnValue
  @Override
  public final boolean remove(@Nullable Object element) {
    return remove(element, 1) > 0;
  }

  @CanIgnoreReturnValue
  @Override
  public int remove(@Nullable Object element, int occurrences) {
    throw new UnsupportedOperationException();
  }

  @CanIgnoreReturnValue
  @Override

    Set<E> elementSet = getMultiset().elementSet();
    assertTrue(elementSet.remove(e0()));
    assertEmpty(getMultiset());
    assertEquals(expectedSize, getMultiset().size());
  }

  @CollectionFeature.Require(SUPPORTS_REMOVE)
  public void testElementSetRemoveAbsent() {
    Set<E> elementSet = getMultiset().elementSet();
    assertFalse(elementSet.remove(e3()));
    expectUnchanged();
  }

        if (cycle != null) {
            // remove edge which introduced cycle
            removeEdge(from, to);
            throw new CycleDetectedException(
                    "Edge between '" + from.label + "' and '" + to.label + "' introduces to cycle in the graph", cycle);
        }
    }

    void removeEdge(Vertex from, Vertex to) {
        from.children.remove(to);
        to.parents.remove(from);
    }