Shown with a cast-on count of 21 stitches.  

• Rows 1 and 11 (RS): K2, *k1, yo, ssk, k3, k2tog, yo, repeat from * to last 3 sts, k3.
• Rows 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, and 26: K2, p1, *p8, repeat from * to last 2 sts, k2.
• Rows 3, 7, 13, and 17: K2, *k2, yo, ssk, k1, k2tog, yo, k1, repeat from * to last 3 sts, k3.
• Rows 5 and 15: K2, *k1, yo, ssk, yo, sl2-k1-p2sso, yo, k2tog, yo, repeat from * to last 3 sts, k3.
• Rows 9 and 19: K2, *k3, yo, sl2-k1-p2sso, yo, k2, repeat from * to last 3 sts, k3.
• Rows 21, 23, and 25: K2, *k1, k2tog, [k1, yo] twice, k1, ssk, repeat from * to last 3 sts, k3.