Works on multiples of 2 plus 1 stitches.
Row 1: Knit in the front and back of each stitch. You will have twice as many stitches as when you started.
Row 2: Knit two together, *purl two together, knit two together. Repeat from * across. You will be back at the number of stitches you cast on.
Repeat these two rows for pattern.