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abhgh
on July 13, 2020
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All People in Canada are the Same Age (1997)
The version I had come across was "all billiard balls have the same color" in Liu's Discrete Mathematics [1]. It is an exercise problem in one of the chapters.
[1]
https://www.amazon.com/Elements-Discrete-Mathematics-C-Liu/d...
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[1] https://www.amazon.com/Elements-Discrete-Mathematics-C-Liu/d...