On an even number of stitches + 2 edge stitches.
Row 1: 1 slip stitch, *1 yarn over, 2 knit sts, pass the yarn over the 2 knit sts.*
Repeat from * to * until the last st., 1 knit st.
Row 2: 1 slip stitch, knit the rest of the sts. purlwise.
Repeat these 2 rows until the desired height.
Happy knitting.
