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This is a pattern loosely based on the Undulating Rib Socks from Favorite Socks -- but completely different. I wanted some purl stitches and some knit stitches, so (even though you can't see it in the above picture, unstretched) I did a 3x1 rib then a 1x3 rib to achieve the look. I think it will work when it is actually on a foot.
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