Shown with a cast-on count of 55 stitches.  

• Rounds 1-2 and 22: *K1, p2, k2, p4, k1, p4, k2, p2, repeat from * to last st, k1.
• Rounds 3-4: *K1, yo, p2, k2, p3, k3tog, p3, k2, p2, yo, repeat from * to last st, k1.
• Rounds 5-6: *K1, yo, k1, p2, k2, p2, k3tog, p2, k2, p2, k1, yo, repeat from * to last st, k1.
• Rounds 7-8: *K1, yo, p1, k2, p2, k1, p1, k3tog, p1, k1, p2, k2, p1, yo, repeat from * to last st, k1.
• Rounds 9-10: *K1, yo, p2, k2, p2, k1, k3tog, k1, p2, k2, p2, yo, repeat from * to last st, k1.
• Rounds 11-12: *K1, yo, p3, k2, p2, k3tog, p2, k2, p3, yo, repeat from * to last st, k1.
• Rounds 13-14: K2tog, *p3, k2, p2, yo, k1, yo, p2, k2, p3, k3tog, repeat from * to last 17 sts, p3, k2, p2, yo, k1, yo, p2, k2, p3, ssk.
• Rounds 15-16: K2tog, *p2, k2, p2, k1, yo, k1, yo, k1, p2, k2, p2, k3tog, repeat from * to last 17 sts, p2, k2, p2, k1, yo, k1, yo, k1, p2, k2, p2, ssk.
• Rounds 17-18: K2tog, *p1, k1, p2, k2, p1, yo, k1, yo, p1, k2, p2, k1, p1, k3tog tbl, repeat from * to last 17 sts, p1, k1, p2, k2, p1, yo, k1, yo, p1, k2, p2, k1, p1, ssk.
• Rounds 19-21: K2tog, *p2, k2, p3, yo, k1, yo, p3, k2, p2, k3tog tbl, repeat from * to last 17 sts, p2, k2, p3, yo, k1, yo, p3, k2, p2, ssk.