public Map<Object, Object> create(List<?> keys) {
        return ImmutableMap.copyOf(
            Lists.transform(keys, k -> Maps.immutableEntry(k, "dummy value")));
      }
    },
    BUILDER_PUT_ONE_BY_ONE {
      @Override
      public Map<Object, Object> create(List<?> keys) {
        ImmutableMap.Builder<Object, Object> builder = ImmutableMap.builder();
        for (Object k : keys) {
          builder.put(k, "dummy value");

      this.keys = new @Nullable Object[initialCapacity];
      this.values = new @Nullable Object[initialCapacity];
    }

    private void ensureCapacity(int minCapacity) {
      if (minCapacity > keys.length) {
        int newCapacity = ImmutableCollection.Builder.expandedCapacity(keys.length, minCapacity);
        this.keys = Arrays.copyOf(keys, newCapacity);

      SampleElements<Entry<K, V>> mapEntries(SampleElements<K> keys, SampleElements<V> values) {
    return new SampleElements<>(
        Helpers.mapEntry(keys.e0(), values.e0()),
        Helpers.mapEntry(keys.e1(), values.e1()),
        Helpers.mapEntry(keys.e2(), values.e2()),
        Helpers.mapEntry(keys.e3(), values.e3()),
        Helpers.mapEntry(keys.e4(), values.e4()));
  }

  public E e0() {
    return e0;
  }

      SampleElements<Entry<K, V>> mapEntries(SampleElements<K> keys, SampleElements<V> values) {
    return new SampleElements<>(
        Helpers.mapEntry(keys.e0(), values.e0()),
        Helpers.mapEntry(keys.e1(), values.e1()),
        Helpers.mapEntry(keys.e2(), values.e2()),
        Helpers.mapEntry(keys.e3(), values.e3()),
        Helpers.mapEntry(keys.e4(), values.e4()));
  }

  public E e0() {
    return e0;
  }

                    map.putAll(ENTRIES_TO_FILTER);
                    return Maps.filterKeys(map, FILTER_KEYS);
                  }
                })
            .named("Maps.filterKeys[Map, Predicate]")
            .withFeatures(
                MapFeature.ALLOWS_NULL_KEYS,
                MapFeature.ALLOWS_NULL_VALUES,
                MapFeature.ALLOWS_ANY_NULL_QUERIES,

    }
  }

  @CheckForNull private transient Node<K, V> head; // the head for all keys
  @CheckForNull private transient Node<K, V> tail; // the tail for all keys
  private transient Map<K, KeyList<K, V>> keyToKeyList;
  private transient int size;

  /*
   * Tracks modifications to keyToKeyList so that addition or removal of keys invalidates
   * preexisting iterators. This does *not* track simple additions and removals of values

import javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * A collection that maps keys to values, similar to {@link Map}, but in which each key may be
 * associated with <i>multiple</i> values. You can visualize the contents of a multimap either as a
 * map from keys to <i>nonempty</i> collections of values:
 *
 * <ul>
 *   <li>a → 1, 2
 *   <li>b → 3
 * </ul>
 *

import java.util.Map;
import javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * A {@code BiMap} backed by an {@code EnumMap} instance for keys-to-values, and a {@code HashMap}
 * instance for values-to-keys. Null keys are not permitted, but null values are. An {@code
 * EnumHashBiMap} and its inverse are both serializable.
 *
 * <p>See the Guava User Guide article on <a href=

 * returns collections whose iterators follow the ordering in which the data was added to the
 * multimap.
 *
 * <p>The collections returned by {@code keySet}, {@code keys}, and {@code asMap} iterate through
 * the keys in the order they were first added to the multimap. Similarly, {@code get}, {@code
 * removeAll}, and {@code replaceValues} return collections that iterate through the values in the

      return;
    }

    Set<K> keys = map.keySet();
    K key = keys.iterator().next();
    if (supportsRemove) {
      int initialSize = map.size();
      keys.remove(key);
      assertEquals(initialSize - 1, map.size());
      assertFalse(map.containsKey(key));
    } else {
      try {
        keys.remove(key);
        fail("Expected UnsupportedOperationException.");