How do you cut a yarn fringe?

How do you cut yarn evenly with fringe?

Start cutting from the bottom edge and as you go up, move your left hand up the ruler so that you get a nice tight layer of yarn to cut. Cut all the way up and through all layers of the fringe. Gather up the cut edges of the fringe into a nice pile and admire that nice straight edge of fringe left on your afghan.

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