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( A= left[ begin array rrr 1 & 2 & 1 0 & 1 & -1 3 & -1 & 1 end array right], Delta= left[ begin array ccc x-1 & 2 & 3 1 & x-1 & 1 3 & 2 & x-1 end array right] ) | Suva Ai