Shown with a cast-on count of 21 stitches.  

• Row 1 (RS): K6, [k2tog, yo] twice, k1, [yo, ssk] twice, k6.
• Rows 2 and 14: K8, p5, k8.
• Row 3: K5, k2tog, yo, k2tog, k1, [yo, k1] twice, ssk, yo, ssk, k5.
• Rows 4 and 12: K7, p7, k7.
• Row 5: K4, k2tog, yo, k2tog, k2, yo, k1, yo, k2, ssk, yo, ssk, k4.
• Rows 6 and 10: K6, p9, k6.
• Row 7: K3, k2tog, yo, k2tog, k3, yo, k1, yo, k3, ssk, yo, ssk, k3.
• Row 8: K5, p11, k5.
• Row 9: K5, yo, ssk, k7, k2tog, yo, k5.
• Row 11: K6, yo, ssk, k5, k2tog, yo, k6.
• Row 13: K7, yo, ssk, k3, k2tog, yo, k7.
• Row 15: K8, yo, ssk, k1, k2tog, yo, k8.
• Row 16: K9, p3, k9.
• Row 17: K9, yo, sl1-k2tog-psso, yo, k9.
• Row 18: K10, p1, k10.