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det [[0,1,1,1,1],[1,0,x,x,x],[1,x,0,x,x],[1,x,x,0,x],[1,x,x,x,0]]
det [[0,1,1,1,1],[1,0,x,x,x],[1,x,0,x,x],[1,x,x,0,x],[1,x,x,x,0]]
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