CustomMultimap(Map<K, Collection<V>> map, Supplier<? extends Collection<V>> factory) {
      super(map);
      this.factory = checkNotNull(factory);
    }

    @Override
    Set<K> createKeySet() {
      return createMaybeNavigableKeySet();
    }

    @Override
    Map<K, Collection<V>> createAsMap() {
      return createMaybeNavigableAsMap();
    }

    @Override

      }
    }
  }

  @LazyInit private transient @Nullable Set<K> keySetView;

  @Override
  public Set<K> keySet() {
    return (keySetView == null) ? keySetView = createKeySet() : keySetView;
  }

  Set<K> createKeySet() {
    return new KeySetView();
  }

  @WeakOuter
  class KeySetView extends Maps.KeySet<K, V> {
    KeySetView() {
      super(CompactHashMap.this);
    }

        return Spliterators.spliterator(this, Spliterator.ORDERED | Spliterator.DISTINCT);
      }
    }
    return new EntrySetImpl();
  }

  @Override
  Set<K> createKeySet() {
    @WeakOuter
    final class KeySetImpl extends KeySetView {
      @Override
      public @Nullable Object[] toArray() {
        return ObjectArrays.toArrayImpl(this);
      }

      @Override

    @LazyInit private transient @Nullable Set<K> keySet;

    @Override
    public Set<K> keySet() {
      Set<K> result = keySet;
      return (result == null) ? keySet = createKeySet() : result;
    }

    Set<K> createKeySet() {
      return new KeySet<>(this);
    }

    @LazyInit private transient @Nullable Collection<V> values;

    @Override
    public Collection<V> values() {

    @LazyInit private transient @Nullable Set<K> keySet;

    @Override
    public Set<K> keySet() {
      Set<K> result = keySet;
      return (result == null) ? keySet = createKeySet() : result;
    }

    Set<K> createKeySet() {
      return new KeySet<>(this);
    }

    @LazyInit private transient @Nullable Collection<V> values;

    @Override
    public Collection<V> values() {

      }
    }
  }

  @LazyInit private transient @Nullable Set<K> keySetView;

  @Override
  public Set<K> keySet() {
    return (keySetView == null) ? keySetView = createKeySet() : keySetView;
  }

  Set<K> createKeySet() {
    return new KeySetView();
  }

  @WeakOuter
  private final class KeySetView extends AbstractSet<K> {
    @Override
    public int size() {

      }

      @Override
      public ListIterator<V> listIterator(int index) {
        return new ValueForKeyIterator(key, index);
      }
    };
  }

  @Override
  Set<K> createKeySet() {
    @WeakOuter
    final class KeySetImpl extends Sets.ImprovedAbstractSet<K> {
      @Override
      public int size() {
        return keyToKeyList.size();
      }

      @Override

   * appear in this multimap.
   */
  @Override
  public ImmutableSet<K> keySet() {
    return map.keySet();
  }

  @Override
  Set<K> createKeySet() {
    throw new AssertionError("unreachable");
  }

  /**
   * Returns an immutable map that associates each key with its corresponding values in the

   * appear in this multimap.
   */
  @Override
  public ImmutableSet<K> keySet() {
    return map.keySet();
  }

  @Override
  Set<K> createKeySet() {
    throw new AssertionError("unreachable");
  }

  /**
   * Returns an immutable map that associates each key with its corresponding values in the

  }

  /** Returns an immutable sorted set of the keys in this map. */
  @Override
  public ImmutableSortedSet<K> keySet() {
    return keySet;
  }

  @Override
  ImmutableSet<K> createKeySet() {
    throw new AssertionError("should never be called");
  }

  /**
   * Returns an immutable collection of the values in this map, sorted by the ordering of the
   * corresponding keys.
   */