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ker {{5, 6 ,-10,-5,17,17 },{1, 4 ,-5,0,-1,0 },{1, 2 ,-3,0,-1,0 },{1, 2 ,-3,0,0,1 },{0, 0 ,5,-5,22,17 },{ 0, 0 ,-6,6,-26,-20 }}^2
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