Shown with a cast-on count of 38 stitches.  

• Rows 1, 3, 5, 7, and 9 (RS): Purl.
• Row 2: CO 1 st, p2, *k9, yo, k1, yo, k3, sl1-k2tog-psso, p2, repeat from *, CO 1 st (multiple of 18 sts, plus 4).
• Row 4: K1, CO 1 st, p2, *k10, yo, k1, yo, k2, sl1-k2tog-psso, p2, repeat from * to last st, CO 1 st, k1 (multiple of 18 sts, plus 6).
• Row 6: K2, CO 1 st, p2, *k3tog, k4, yo, k1, yo, k3, yo, k1, yo, k1, sl1-k2tog-psso, p2, repeat from * to last 2 sts, CO 1 st, k2 (multiple of 18 sts, plus 8).
• Row 8: K3, CO 1 st, p2, *k3tog, k3, yo, k1, yo, k9, p2, repeat from * to last 3 sts, CO 1 st, k3 (multiple of 18 sts, plus 10).
• Row 10: K4, CO 1 st, p2, *k3tog, k2, yo, k1, yo, k10, p2, repeat from * to last 4 sts, CO 1 st, k4 (multiple of 18 sts, plus 12).
• Row 11 (WS): Purl.
• Row 12: K5, CO 1 st, p2, *k3tog, k1, yo, k1, yo, k3, yo, k1, yo, k4, sl1-k2tog-psso, p2, repeat from * to last 5 sts, CO 1 st, k5 (multiple of 18 sts, plus 14).