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    This is horribly worded. The question specifies that "Two jokes (x1, y1) and (x2, y2) differ if they don't contain the same events."

    This seems to imply that if (12, 31) was in the list three times, then two of them could count as a joke, but no more times than that. But, as it turns out, all three possible pairs of those identical events should count as three separate jokes. This is not clear at all from the statement, as the jokes ((12, 31), (12, 31)) and ((12, 31), (12, 31)) contain the same events.