MS Excel
How do you delete a column?

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

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MS Excel
A circular reference is

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

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