combinations,
        new Function<List<Object>, CacheBuilder<Object, Object>>() {
          @Override
          public CacheBuilder<Object, Object> apply(List<Object> combination) {
            return createCacheBuilder(
                (Integer) combination.get(0),
                (Integer) combination.get(1),
                (Integer) combination.get(2),
                (DurationSpec) combination.get(3),