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If A = [{:(1,2),(-2,3):}], B= [{:(2,1),(...

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

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