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With double-pointed or circular needle, cast-on stitches.
Knit across row.
Once that row is complete, slide stitches to the opposite end of the needle and switch hands so that the needle (or end, if you’re working with a circular) with the knit row is in your left.
The working yarn will appear to be at the wrong end of the row, but just bring it behind the stitches and begin knitting again.
The strand of yarn stretched across the back will create a cording effect. Continue in this manner until you achieve the desired length.