e message here is just what I tried to advise you about
    from the very beginnings of my entry into this exposition,
    namely, that indexed, keyed, ordered, or sequenced tables
    are not legitimate ways of addressing this problem, among
    other things, because they convert a set of tuples into a
    list of tuples or a sequence of tuples, which is a rather
    distinct mathematical object or data structure, no matter
    how one chooses to look at it.

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