for (int j = i; j < strings.length; j++) {
        assertThat(set.subSet(strings[i], true, strings[j], true))
            .containsExactlyElementsIn(sortedNumberNames(i, j + 1))
            .inOrder();
      }
    }
  }

  private static ImmutableList<String> sortedNumberNames(int i, int j) {
    return ImmutableList.copyOf(SORTED_NUMBER_NAMES.subList(i, j));
  }