Sets.newLinkedHashSet(Iterables.transform(set, Optional::fromNullable));
      optionalSets.add(optionalSet);
    }
    Set<List<Optional<?>>> cartesianProduct = Sets.cartesianProduct(optionalSets);
    return Iterables.transform(cartesianProduct, objs -> Lists.transform(objs, Optional::orNull));
  }

  private CacheBuilder<Object, Object> createCacheBuilder(
      @Nullable Integer concurrencyLevel,

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.google.common.collect;

import static com.google.common.collect.Lists.cartesianProduct;
import static com.google.common.collect.Lists.transform;
import static com.google.common.truth.Truth.assertWithMessage;
import static java.lang.Math.max;
import static java.util.Arrays.asList;

   *     a provided list is null
   * @since 19.0
   */
  @SafeVarargs
  public static <B> List<List<B>> cartesianProduct(List<? extends B>... lists) {
    return cartesianProduct(Arrays.asList(lists));
  }

  /**
   * Returns a list that applies {@code function} to each element of {@code fromList}. The returned

   *     a provided list is null
   * @since 19.0
   */
  @SafeVarargs
  public static <B> List<List<B>> cartesianProduct(List<? extends B>... lists) {
    return cartesianProduct(Arrays.asList(lists));
  }

  /**
   * Returns a list that applies {@code function} to each element of {@code fromList}. The returned

   * @throws IllegalArgumentException if the cartesian product size exceeds the {@code int} range
   * @since 2.0
   */
  @SafeVarargs
  public static <B> Set<List<B>> cartesianProduct(Set<? extends B>... sets) {
    return cartesianProduct(asList(sets));
  }

  private static final class CartesianSet<E> extends ForwardingCollection<List<E>>
      implements Set<List<E>> {

   * @throws IllegalArgumentException if the cartesian product size exceeds the {@code int} range
   * @since 2.0
   */
  @SafeVarargs
  public static <B> Set<List<B>> cartesianProduct(Set<? extends B>... sets) {
    return cartesianProduct(asList(sets));
  }

  private static final class CartesianSet<E> extends ForwardingCollection<List<E>>
      implements Set<List<E>> {

    List<List<Class<?>>> typesLists = new ArrayList<>();
    for (int i = 0; i < 2; i++) {
      typesLists.add(POSSIBLE_PARAM_TYPES);
      for (List<Class<?>> curr : Lists.cartesianProduct(typesLists)) {
        allOverloads.add(
            ImmutableList.<Class<?>>builder()
                .add(predicateType)
                .add(String.class) // the format string
                .addAll(curr)

    List<List<Class<?>>> typesLists = new ArrayList<>();
    for (int i = 0; i < 2; i++) {
      typesLists.add(POSSIBLE_PARAM_TYPES);
      for (List<Class<?>> curr : Lists.cartesianProduct(typesLists)) {
        allOverloads.add(
            ImmutableList.<Class<?>>builder()
                .add(predicateType)
                .add(String.class) // the format string
                .addAll(curr)