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Questions on the basic structure of the Mathematica language (Wolfram language) including atomic data types, syntax etc

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Set does not work

I tried following code, but it does not work as expected: Do[Set[a[[1]],a[[2]]],{a,{x->2,y->5,z->x+y}}] {x,y,z} I want the result to be {2,5,7}, but it becomes just {x,y,z}. I tried a[[1]]=a[[2 …
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