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Calculate whenever possible,[[1,2],[2,1]...

Calculate whenever possible,`[[1,2],[2,1]][[3,1],[1,1]]`

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`[[1,2],[2,1]][[3,1],[1,1]]`
`=[[1.3 +2.1" "1.1+2.1],[2.3+1.1 " "2.1+1.1]]=[[5,3],[7,3]]`
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