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If A=[{:(1,1,-1),(2,0,3),(3,-1,2):}],B=[...

If `A=[{:(1,1,-1),(2,0,3),(3,-1,2):}],B=[{:(1,3),(0,2),(-1,4):}]andC=[{:(1,2,3,-4),(2,0,-2,1):}]`, find A(BC) , (AB)C and show that (AB) C=A(BC),

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