this.valueStrengths = Sets.newLinkedHashSet(valueStrengths);
    return this;
  }

  Iterable<CacheBuilder<Object, Object>> buildAllPermutations() {
    Iterable<List<Object>> combinations =
        buildCartesianProduct(
            concurrencyLevels,
            initialCapacities,
            maximumSizes,
            expireAfterWrites,
            expireAfterAccesses,
            refreshes,
            keyStrengths,