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If A=[{:(,0,6,7),(,-6,0,8),(,7,-8,0):}],...

If `A=[{:(,0,6,7),(,-6,0,8),(,7,-8,0):}], B=[{:(,0,1,1),(,1,0,2),(,1,2,0):}], C=[{:(,2),(,-2),(,3):}]` calculate AC, BC and (A+B)C.
Also verify (A+B)C=AC+BC

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