Poker players resolutely say "four of a kind" when technically they should probably say "I have a tetrad of of aces".
And of course a group of four singers is always a quartet instead of a tetrad.
We have to recognize word overlap in languages like English which are drawn from so many other sources.
@Algot Looks like Ancient Greek and Latin couldn't agree to disagree on this part of the quaint quadratic query.
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