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if A=[{:(1,2,-3),(5,0,2),(1,-1,1):}],B=[...

`if A=[{:(1,2,-3),(5,0,2),(1,-1,1):}],B=[{:(3,-1,2),(4,2,5),(2,0,3):}]and c=[{:(4,1,2),(0,3,2),(1,-2,3):}],` then compure (A+B) and (B-C), Also , verify that A+(B-C)=(A+B)-C.`

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