Shown with a cast-on count of 21 stitches.  

• Round 1: K10, yo, ssk, k9.
• Rounds 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20: Knit.
• Round 3: K8, k2tog, yo, knit to last 10 sts, yo, ssk, k8.
• Round 5: K7, k2tog, yo, k3, yo, ssk, k7.
• Round 7: K6, k2tog, yo, k5, yo, ssk, k6.
• Round 9: K5, k2tog, yo, k7, yo, ssk, k5.
• Round 11: K4, k2tog, yo, k9, yo, ssk, k4.
• Round 13: K3, k2tog, yo, k11, yo, ssk, k3.
• Round 15: K4, yo, ssk, k4, yo, ssk, k3, k2tog, yo, k4.
• Round 17: K5, yo, ssk, k1, k2tog, yo, k1, yo, ssk, k1, k2tog, yo, k5.
• Round 19: K6, yo, k3tog, yo, k3, yo, k3tog, yo, k6.