Shown with a cast-on count of 28 stitches.  

• Row 1 (RS): K2, *k1, yo, ssk, k9, repeat from * to last 2 sts, k2.
• Rows 2, 4, 6, 8, 10, 12, 14, 16, and 18: K2, *p12, repeat from * to last 2 sts, k2.
• Row 3: K2, *k1, yo, k1, ssk, k8, repeat from * to last 2 sts, k2.
• Row 5: K2, *k1, yo, k2, ssk, k7, repeat from * to last 2 sts, k2.
• Row 7: K2, *k1, yo, k3, ssk, k6, repeat from * to last 2 sts, k2.
• Row 9: K2, *k1, yo, k4, ssk, k5, repeat from * to last 2 sts, k2.
• Row 11: K2, *k1, yo, k5, ssk, k4, repeat from * to last 2 sts, k2.
• Row 13: K2, *k1, yo, k6, ssk, k3, repeat from * to last 2 sts, k2.
• Row 15: K2, *k1, yo, k7, ssk, k2, repeat from * to last 2 sts, k2.
• Row 17: K2, *k1, yo, k8, ssk, k1, repeat from * to last 2 sts, k2.