/**
   * Returns a {@link Collector} that accumulates elements into an {@code ImmutableBiMap} whose keys
   * and values are the result of applying the provided mapping functions to the input elements.
   * Entries appear in the result {@code ImmutableBiMap} in encounter order.
   *
   * <p>If the mapped keys or values contain duplicates (according to {@link

        .withFeatures(
            MapFeature.GENERAL_PURPOSE,
            MapFeature.ALLOWS_NULL_KEYS,
            MapFeature.ALLOWS_NULL_VALUES,
            MapFeature.ALLOWS_ANY_NULL_QUERIES,
            MapFeature.FAILS_FAST_ON_CONCURRENT_MODIFICATION,
            MapFeature.RESTRICTS_KEYS,
            MapFeature.RESTRICTS_VALUES,
            CollectionFeature.SUPPORTS_ITERATOR_REMOVE,

    };
  }

  /**
   * Returns an immutable multiset containing all the keys in this multimap, in the same order and
   * with the same frequencies as they appear in this multimap; to get only a single occurrence of
   * each key, use {@link #keySet}.
   */
  @Override
  public ImmutableMultiset<K> keys() {
    return (ImmutableMultiset<K>) super.keys();
  }

  @Override
  ImmutableMultiset<K> createKeys() {

        }
      }
      return new ValuesImpl();
    }
  }

  @Override
  Multiset<K> createKeys() {
    return new Keys();
  }

  @WeakOuter
  class Keys extends Multimaps.Keys<K, V> {
    Keys() {
      super(FilteredEntryMultimap.this);
    }

    @Override
    public int remove(@CheckForNull Object key, int occurrences) {

  }

  /**
   * Returns an immutable multiset containing all the keys in this multimap, in the same order and
   * with the same frequencies as they appear in this multimap; to get only a single occurrence of
   * each key, use {@link #keySet}.
   */
  @Override
  public ImmutableMultiset<K> keys() {
    return (ImmutableMultiset<K>) super.keys();
  }

  @Override
  ImmutableMultiset<K> createKeys() {

  private Multiset<Integer> multiset;
  private ImmutableList<Integer> keys;
  private ExecutorService threadPool;

  @BeforeExperiment
  void setUp() throws Exception {
    multiset = implSupplier.get();
    ImmutableList.Builder<Integer> builder = ImmutableList.builder();
    for (int i = 0; i < size; i++) {
      builder.add(i);
    }
    keys = builder.build();
    threadPool =

    map.remove("a");
    assertFalse(underlying.containsKey("a"));

    Set<String> keys = map.keySet();
    keys.remove("b");
    assertFalse(underlying.containsKey("b"));

    Iterator<String> keyIterator = keys.iterator();
    keyIterator.next();
    keyIterator.remove();
    assertFalse(underlying.containsKey("c"));

      for (K element : insertionOrder) {
        entries.add(mapEntry(element, v));
      }

      List<K> keys = new ArrayList<>();
      for (Entry<K, V> entry : mapGenerator.order(entries)) {
        keys.add(entry.getKey());
      }
      return keys;
    }

    @Override
    public OneSizeTestContainerGenerator<Map<K, V>, Entry<K, V>> getInnerGenerator() {
      return mapGenerator;

public class ImmutableListMultimap<K, V> extends ImmutableMultimap<K, V>
    implements ListMultimap<K, V> {
  /**
   * Returns a {@link Collector} that accumulates elements into an {@code ImmutableListMultimap}
   * whose keys and values are the result of applying the provided mapping functions to the input
   * elements.
   *
   * <p>For streams with defined encounter order (as defined in the Ordering section of the {@link

                    }.sortedCopy(insertionOrder);
                  }
                })
            .named("TreeMultimap nullsFirst")
            .withFeatures(
                MapFeature.ALLOWS_NULL_KEYS,
                MapFeature.ALLOWS_NULL_VALUES,
                MapFeature.ALLOWS_ANY_NULL_QUERIES,
                MapFeature.GENERAL_PURPOSE,
                MapFeature.FAILS_FAST_ON_CONCURRENT_MODIFICATION,