MS Excel
Documentation should include

Information on the purpose of the workbook
Destination and users of the output data
All of these
Source of input data

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MS Excel
How do you delete a column?

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
Right click the column heading you want to delete and select delete from the shortcut menu

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