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Problem.—"The Governor of Kgovjni wants to give a very small dinner party, and invites his father's brother-in-law, his brother's father-in-law, his father-in-law's brother, and his brother-in-law's father. Find the number of guests."

Answer.—"One."

Ten answers have been received. Of these, one is wrong,, who insists on inviting two guests, one being the Governor's wife's brother's father. If she had taken his sisters husband's father instead, she would have found it possible to reduce the guests to one.