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( begin array l A= left[ begin array ccc p+c & p-b-c & p-c-a p-a-b & p+a & p-c-a p-a-b & p-b-c & p+b end array right] S=x+3 y-z, L=2 x-y+2 z, M=x+2 y-3 z end array ) | Suva Ai