Shown with a cast-on count of 28 stitches.  

• Row 1 (RS): K1, *yo, k2, [k2tog] twice, k2, yo, k1, repeat from *.
• Rows 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20: Purl.
• Row 3: K2, *yo, k2, [k2tog] twice, k2, yo, k1, repeat from * to last 8 sts, yo, k2, k2tog, k4.
• Row 5: K3, *yo, k2, [k2tog] twice, k2, yo, k1, repeat from * to last 7 sts, yo, k2, k2tog, k3.
• Row 7: K4, *yo, k2, [k2tog] twice, k2, yo, k1, repeat from * to last 6 sts, yo, k2, k2tog, k2.
• Row 9: K5, *yo, k2, [k2tog] twice, k2, yo, k1, repeat from * to last 5 sts, yo, k2, k2tog, k1.
• Row 11: K1, yo, k1, k2tog tbl, *k2tog tbl, k2, yo, k1, yo, k2, k2tog tbl, repeat from * to last 6 sts, k2tog tbl, k2, yo, k2.
• Row 13: K3, *k2tog tbl, k2, yo, k1, yo, k2, k2tog tbl, repeat from * to last 7 sts, k2tog tbl, k2, yo, k3.
• Row 15: K2, *k2tog tbl, k2, yo, k1, yo, k2, k2tog tbl, repeat from * to last 8 sts, k2tog tbl, k2, yo, k4.
• Row 17: K1, *k2tog tbl, k2, yo, k1, yo, k2, k2tog tbl, repeat from * to last 9 sts, k2tog tbl, k2, yo, k1, yo, k2, k2tog tbl.
• Row 19: *K2tog tbl, k2, yo, k1, yo, k2, k2tog tbl, repeat from * to last 10 sts, k2tog tbl, k2, yo, k1, yo, k2, k2tog tbl, k1.