Shown with a cast-on count of 47 stitches.  

• Rows 1 and 13 (RS): K1, *k10, yo, k1, yo, k3, sl1-k2tog-psso, repeat from * to last 12 sts, k12.
• Rows 2, 4, 6, 8, 10, 12, 14, 16, and 18: Purl.
• Rows 3 and 15: K1, *k11, yo, k1, yo, k2, sl1-k2tog-psso, repeat from * to last 12 sts, k12.
• Row 5: K1, *k1, k3tog, k4, yo, k1, yo, k3, yo, k1, yo, k1, sl1-k2tog-psso, repeat from * to last 12 sts, k1, k3tog, k4, yo, k1, yo, k3.
• Row 7: K1, *k1, k3tog, k3, yo, k1, yo, k9, repeat from * to last 12 sts, k1, k3tog, k3, yo, k1, yo, k4.
• Row 9: K1, *k1, k3tog, k2, yo, k1, yo, k10, repeat from * to last 12 sts, k1, k3tog, k2, yo, k1, yo, k5.
• Row 11: K1, *k1, k3tog, [k1, yo] twice, k3, yo, k1, yo, k4, sl1-k2tog-psso, repeat from * to last 12 sts, k1, k3tog, [k1, yo] twice, k6.
• Row 17: K1, *k12, [yo, k1] twice, sl1-k2tog-psso, repeat from * to last 12 sts, k12.