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;

    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)