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when toggle format what by license comment
Jun 2, 2018 at 19:48 comment added Fan Zheng I guess you mean $3^{-(|C|+|C'|-1)}$, because the black stone at (0,0) is given.
Jun 2, 2018 at 1:18 history edited Robert Israel CC BY-SA 4.0
added 123 characters in body
Jun 2, 2018 at 0:50 history answered Robert Israel CC BY-SA 4.0