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Statement 1: A=[(4,0,4),(2,2,2), (1,2,1)...

Statement 1: `A=[(4,0,4),(2,2,2), (1,2,1)] B^(-1)=[(1,3,3),(1,4,3),(1,3,4)]` . Then `(A B)^(-1)` does not exist. Statement 2: Since `|A|=0,(A B)^(-1)=B^(-1)A^(-1)` is meaning-less.

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