def METHOD_NAME(self, encodings):
    single, pair = encodings
    assert single.word_to_chars(2) == (7, 18)
    assert pair.word_to_chars(2) == (7, 18)
    assert pair.word_to_chars(2, 0) == (7, 18)
    assert pair.word_to_chars(2, 1) == (6, 7)