This is how 'The Knitter's Bible' says to do a yo at the edge of your work:
Before a knit stitch, bring the yarn forward as if to purl, knit the first stitch bringing the yarn over the right needle as you do so.
Before a purl stitch, take the yarn back as though to knit, purl the first stitch bringing the yarn over the needle as you do so.
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Ravelry username: HeatherDD