def coleman_liau_index(letter_count, word_count):
    """Given a number of letters and number of words in a sentence, computes the
    coleman-liau index

    Keyword arguments:
    letter_count -- number of letters in the sentence
    word_count -- number of words in the sentence
    """

    return (
        0.0588 * letter_count / (word_count * 100) - 0.296 / (word_count * 100) - 15.8
    )