Function<? super T, ? extends V> valueFunction,
          BinaryOperator<V> mergeFunction) {
    checkNotNull(keyFunction);
    checkNotNull(valueFunction);
    checkNotNull(mergeFunction);
    return Collectors.collectingAndThen(
        Collectors.toMap(keyFunction, valueFunction, mergeFunction, LinkedHashMap::new),
        ImmutableMap::copyOf);
  }

          java.util.function.Function<? super T, ? extends V> valueFunction,
          BinaryOperator<V> mergeFunction,
          java.util.function.Supplier<I> tableSupplier) {
    return TableCollectors.<T, R, C, V, I>toTable(
        rowFunction, columnFunction, valueFunction, mergeFunction, tableSupplier);
  }

  /**
   * Returns an immutable cell with the specified row key, column key, and value.
   *

          Function<? super T, ? extends K> keyFunction,
          Function<? super T, ? extends V> valueFunction,
          BinaryOperator<V> mergeFunction) {
    return CollectCollectors.toImmutableMap(keyFunction, valueFunction, mergeFunction);
  }

  /**
   * Returns the empty map. This map behaves and performs comparably to {@link

          java.util.function.Function<? super T, ? extends K> keyFunction,
          java.util.function.Function<? super T, ? extends V> valueFunction,
          BinaryOperator<V> mergeFunction) {
    return CollectCollectors.toImmutableEnumMap(keyFunction, valueFunction, mergeFunction);
  }

  /**
   * Creates a <i>mutable</i>, empty {@code HashMap} instance.
   *

          java.util.function.Function<? super T, ? extends K> keyFunction,
          java.util.function.Function<? super T, ? extends V> valueFunction,
          BinaryOperator<V> mergeFunction) {
    return CollectCollectors.toImmutableEnumMap(keyFunction, valueFunction, mergeFunction);
  }

  /**
   * Creates a <i>mutable</i>, empty {@code HashMap} instance.
   *