How do you sew butterfly corners on a pillow?

How do you finish the edge of a pillow?

A common way to close a pillow is to hand stitch the fourth side of the pillow closed. This is the best method to use when you want the edges of the pillow to appear the same on every side and if you either don’t plan on removing the pillow or want to use stuffing rather than a pillow form, as you sew it inside.

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