Excel should let me revert to a previous value in a cell
 

It would be nice if I could right-click on a cell and click 'Previous Value'
to go back to the old value. More then a few times now I've edited a bunch of
cells only to discover that I needed the previous value in one of the cells.
It would be very inconvenient and sometimes not possible to 'Undo' all the
way back to the cell I originally edited.

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