Solve for C_11, C_12, C_13, C_21, C_22, C_23, C_31, C_32, C_33
C_{11}=11
C_{12}=-6
C_{13}=3
C_{21}=4
C_{22}=2
C_{23}=-1
C_{31}=-20
C_{32}=13
C_{33}=5
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