inverse {{6,6,6,6,6,6,6},{1,1,1,1,1,1,1},{1,1,0,1,0,1,1},{1,1,1,7,1,1,1},{1,3,1,1,1,3,1},{1,1,3,3,3,1,1},{1,1,1,1,1,1,1}}

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