def calculate_query_coverage_coefficient(license_match):
    """
    Calculates a `query_coverage_coefficient` value for that match. For a match:
    1. If this value is 0, i.e. `score`==`match_coverage`*`rule_Relevance`, then
       there are no extra words in that license match.
    2. If this value is a +ve number, i.e. `score`!=`match_coverage`*`rule_Relevance`,
       then there are extra words in that match.

    :param matched_license: LicenseMatch.
    """
    score_coverage_relevance = (
        license_match.match_coverage * license_match.rule_relevance
    ) / 100

    return score_coverage_relevance - license_match.score