How to cut sandpaper straight and neatly

It is very convenient to cut sandpaper into a size that you usually use. Until now, I used to cut with a metal ruler, or cut with mountain folds and valley folds, but I felt like tearing them apart, so the cut surface was inevitably rough.
This time, while I was making a jig, I came up with this method and thought that I could use it, so I uploaded it. Make a crease and rub it firmly to cut it cleanly.
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