}
    }

    /**
     * Associates {@code key} with {@code value} in the built map. If the same key is put more than
     * once, {@link #buildOrThrow} will fail, while {@link #buildKeepingLast} will keep the last
     * value put for that key.
     */
    @CanIgnoreReturnValue
    public Builder<K, V> put(K key, V value) {
      ensureCapacity(size + 1);
      checkEntryNotNull(key, value);

      }
    }

    /**
     * Throws UnsupportedOperationException. A future version may support this operation. Then the
     * value for any given key will be the one that was last supplied in a {@code put} operation for
     * that key.
     *
     * @throws UnsupportedOperationException always
     * @since 31.1
     * @deprecated This method is not currently implemented, and may never be.

    }

    @Override
    protected Collection<List<E>> delegate() {
      return delegate;
    }

    @Override
    public boolean contains(@CheckForNull Object object) {
      if (!(object instanceof List)) {
        return false;
      }
      List<?> list = (List<?>) object;
      if (list.size() != axes.size()) {
        return false;
      }
      int i = 0;

2.  APIs without `@Beta` will remain binary-compatible for the indefinite
    future. (Previously, we sometimes removed such APIs after a deprecation
    period. The last release to remove non-`@Beta` APIs was Guava 21.0.) Even
    `@Deprecated` APIs will remain (again, unless they are `@Beta`). We have no
    plans to start removing things again, but officially, we're leaving our

    Comparator<? super E> comparator = SortedIterables.comparator(sortedSet);
    ImmutableList<E> list = ImmutableList.copyOf(sortedSet);
    if (list.isEmpty()) {
      return emptySet(comparator);
    } else {
      return new RegularImmutableSortedSet<>(list, comparator);
    }
  }

  /**
   * Constructs an {@code ImmutableSortedSet} from the first {@code n} elements of {@code contents}.

  @Beta // TODO: b/288085449 - Remove.
  public static <T extends @Nullable Object> Collector<T, ?, List<T>> least(
      int k, Comparator<? super T> comparator) {
    checkNonnegative(k, "k");
    checkNotNull(comparator);
    return Collector.of(
        () -> TopKSelector.<T>least(k, comparator),
        TopKSelector::offer,
        TopKSelector::combine,
        TopKSelector::topK,

      Multiset<? extends E> multiset) {
    if (multiset instanceof UnmodifiableMultiset || multiset instanceof ImmutableMultiset) {
      @SuppressWarnings("unchecked") // Since it's unmodifiable, the covariant cast is safe
      Multiset<E> result = (Multiset<E>) multiset;
      return result;
    }
    return new UnmodifiableMultiset<>(checkNotNull(multiset));
  }

  /**
   * Simply returns its argument.
   *

   * the provided key, an empty immutable set is returned. The values are in the same order as the
   * parameters used to build this multimap.
   */
  @Override
  public ImmutableSet<V> get(K key) {
    // This cast is safe as its type is known in constructor.
    ImmutableSet<V> set = (ImmutableSet<V>) map.get(key);
    return MoreObjects.firstNonNull(set, emptySet);
  }

      return standardToString();
    }
  }

  /** Returns a map from the ith element of list to i. */
  static <E> ImmutableMap<E, Integer> indexMap(Collection<E> list) {
    ImmutableMap.Builder<E, Integer> builder = new ImmutableMap.Builder<>(list.size());
    int i = 0;
    for (E e : list) {
      builder.put(e, i++);
    }
    return builder.buildOrThrow();
  }

  /**

import com.google.errorprone.annotations.DoNotMock;
import java.io.InvalidObjectException;
import java.io.ObjectInputStream;
import java.io.Serializable;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.function.BinaryOperator;
import java.util.function.Function;
import java.util.stream.Collector;
import javax.annotation.CheckForNull;