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Let A=[{:(1,-2),(5," "4),(3," "0):}],B=[...

Let `A=[{:(1,-2),(5," "4),(3," "0):}],B=[{:(" "3," "1),(" "0," "2),(-3," "5):}]" and "C=[{:(" "4," "3),(-2," "2),(" "1," "6):}].`
Verify that `(A+B)+C=A+(B+C).`

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