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About this Add-on
View -> Sidebar -> Calc
Calc is display in the sidebar.
View -> Toolbars -> Customize...
There are Calc buttons ("Calc" and "Calc Pop").
Calc is called by toolbar button.
*How to use "keep", "change" and "clear" buttons.
The number of text box above is copied to the text box below.
The number of text box above and the number of text box below are replaced.
"clear" ("clear" is not "C" or "CA")
The number of text box below is erased.