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def announce_highest(who, previous_high=0, previous_score=0):
    assert who == 0 or who == 1, 'The who argument should indicate a player.'
    # BEGIN PROBLEM 7
    def say(score0, score1):
        nonlocal previous_high, previous_score
        if who == 0:
            score = score0
        elif who == 1:
            score = score1
        current_score = score - previous_score
        if current_score > previous_high:
            if current_score == 1:
                print("1 point! That's the biggest gain yet for Player", who)
            else:
                print(current_score, "points! That's the biggest gain yet for Player", who)
            return announce_highest(who, current_score, score)
        return announce_highest(who, previous_high, score)
    return say
    # END PROBLEM 7