Shown with a cast-on count of 67 stitches.  

• Rounds 1-2: K3, *p1, k2tog, k3, [yo, ssk] twice, yo, k1, yo, [k2tog, yo] twice, k3, ssk, repeat from * to last 4 sts, p1, k3.
• Rounds 3-4: K3, *p1, k2tog, k2, [yo, ssk] twice, yo, k3, yo, [k2tog, yo] twice, k2, ssk, repeat from * to last 4 sts, p1, k3.
• Rounds 5-6: K3, *p1, k2tog, k1, [yo, ssk] twice, yo, k5, yo, [k2tog, yo] twice, k1, ssk, repeat from * to last 4 sts, p1, k3.
• Rounds 7-8: K3, *p1, k2tog, [yo, ssk] twice, yo, k7, yo, [k2tog, yo] twice, ssk, repeat from * to last 4 sts, p1, k3.
• Rounds 9-10: K3, k2tog, [yo, ssk] twice, yo, k9, yo, [k2tog, yo] twice, *k3tog, [yo, ssk] twice, yo, k9, yo, [k2tog, yo] twice, repeat from * to last 5 sts, k2tog, k3.
• Rounds 11-12: K3, *k1, [yo, k2tog] twice, yo, k3, ssk, p1, k2tog, k3, [yo, ssk] twice, yo, repeat from * to last 4 sts, k4.
• Rounds 13-14: K3, *k2, [yo, k2tog] twice, yo, k2, ssk, p1, k2tog, k2, [yo, ssk] twice, yo, k1, repeat from * to last 4 sts, k4.
• Rounds 15-16: K3, *k3, [yo, k2tog] twice, yo, k1, ssk, p1, k2tog, k1, [yo, ssk] twice, yo, k2, repeat from * to last 4 sts, k4.
• Rounds 17-18: K3, *k4, [yo, k2tog] twice, yo, ssk, p1, k2tog, [yo, ssk] twice, yo, k3, repeat from * to last 4 sts, k4.
• Rounds 19-20: K3, *k5, [yo, k2tog] twice, yo, k3tog, yo, [ssk, yo] twice, k4, repeat from * to last 4 sts, k4.