def get_normalized_distance (pair,s_pronoun) :
    """Normalized distance: if the antecedent and the mention are the same sentence normalize, otherwise 0"""

    if pair[2] == pair[3] :
        distance = abs(int(pair[1][2]) - int(pair[0][2]))
        return round(distance / len(s_pronoun), 3)
    return 0