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If A=[{:(" "1,-1," "2),(" "3," "2," "0),...

If `A=[{:(" "1,-1," "2),(" "3," "2," "0),(-2," "0," "1):}],B=[{:(3,1),(0,2),(-2,5):}]" and "C=[{:(2,1,-3),(3,0,-1):}` then verify that `(AB)C=A(BC).`

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