MS Excel
Ctrl+ D shortcut key in Excel will

Apply double underline for the active cell
Fill down in the selection
None of the listed here
Open the font dialog box

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MS Excel
You can use the format painter multiple times before you turn it off by

Pressing the Alt key and clicking the format painter button
Double clicking the format painter button
Pressing the Ctrl key and clicking the format painter button
You can use the format painter button on ly one time when you click it

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