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> Go ahead and undo that change.

How do I do that?

Thanks for the guide by the way!

C-_ is undo in Emacs. That's hold Control, and press "underscore". On my keyboard (most keyboards?) this requires holding Shift and pressing the "minus" key. Hopefully that's clear.

C-/ is also undo, which is arguably easier to reach :)

Or C-x u

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