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When you input
{ 1 , 2 } (*spaces intended, retype them if you want to copy this*)
The underlying structure (Ctrl+Shift+E) is:
boxes = RowBox[{"{", " ", RowBox[{"1", " ", ",", " ", "2"}], " ", "}"}]
You can evaluate input cell or do something like
ToExpression[boxes]
{1,2}
and it w...
