MS Excel
A circular reference is

A formula that either directly or indirectly depends on itself
A cell that points to a drawing object
Geometric modeling tool
Always erroneous

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MS Excel
How do you delete a column?

Select the column heading you want to delete and select the Delete Row button on the standard toolbar
Right click the column heading you want to delete and select delete from the shortcut menu
Select the row heading you want to delete and select Edit>Delete from the menu
Select the column heading you want to delete and select Insert Delete from the menu

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