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[[z31, z32, z33], [z21, z22, z23], [z11, z12, z13]]
[ 1 0 0]
[z21 1 0]
[z11 z12 1]
[(1, 0, 0), (0, 1, 0), (0, 0, 1)]
[0 1 0]
[0 0 1]
[0 0 0]
[[a11, a12], [a21, a22, a23], [a31, a32, a33, a34]]
[(a11, a11*z21 + a12, a11*z11 + a12*z12)]
(z21, a11)
(z11, a11*z21 + a12)
(0, a11*z11 + a12*z12)
(a11, z21)
(a11*z21 + a12, z11)
(a11*z11 + a12*z12, 0)