What's the Name of That Book??? discussion

UNSOLVED: One specific book > People having 12 other people in common acquaintance

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Susan Rutherford | 1 comments This book was mentioned to me in 1994. The summary is that after a short conversation with almost anyone, we would learn of at least 12 people we have in common.
I thought the title was something like “ The 12 Person Principle”.

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