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If you want your finished blanket or jacket (or other piece on which you put a border) to have a crisp corner, then you need to use the "miter" technique. It's easy -- just do single stitches until you get to where you want to create a crisp corner. Then, place 3 stitches into that corner. On the next row, place 3 stitches into the center stitch of the 3-stitch corner from the previous row. Repeat until the border is the desired measurement.