Then where a11 = 1 a31 = , a 12 = , A32 = A = 1 1 1 ,a13 = 8 8 -8 all a12 a13 4-639 A = a21 922 a23 a31 a32 a33 , az3 = 0 6 2 , a₂1 = ,a22 = , A23

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