1997: The puzzle of the three wise men is old and
well known. I have not been able to trace Mr. S and Mr. P
back beyond its alleged appearance on a bulletin board at Xerox
PARC. 2005 note: The puzzle has been recently traced to the Dutch
mathematician Hans Freudenthal. Freudenthal didn't publish it and
didn't give a reference. The consensus opinion is that Freudenthal
invented it.
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