Shown with a cast-on count of 55 stitches.  

• Round 1: *K4, k2tog, yo, k2tog, yo, k1, yo, k1, yo, k1, yo, ssk, yo, ssk, k3, repeat from * to last st, k1 (multiple of 20 sts, plus 1).
• Round 2: *K3, k2tog, yo, k3, ssk, k1, k2tog, k3, yo, ssk, k2, repeat from * to last st, k1 (multiple of 18 sts, plus 1).
• Round 3: *K2, k2tog, yo, k1, k2tog, yo, k5, yo, ssk, k1, yo, ssk, k1, repeat from * to last st, k1.
• Round 4: *K1, k2tog, yo, k13, yo, ssk, repeat from * to last st, k1.
• Round 5: K2tog, *yo, k2, k2tog, yo, k7, yo, ssk, k2, yo, sl1-k2tog-psso, repeat from * to last 17 sts, yo, k2, k2tog, yo, k7, yo, ssk, k2, yo, ssk.
• Rounds 6 and 12: Knit.
• Round 7: K2, yo, ssk, yo, *ssk, k7, k2tog, yo, k2tog, yo, k1, yo, k1, yo, k1, yo, ssk, yo, repeat from * to last 15 sts, ssk, k7, k2tog, yo, k2tog, yo, k2 (multiple of 20 sts, plus 19).
• Round 8: K5, yo, *ssk, k5, k2tog, yo, k3, ssk, k1, k2tog, k3, yo, repeat from * to last 14 sts, ssk, k5, k2tog, yo, k5 (multiple of 18 sts, plus 19).
• Round 9: K3, yo, ssk, k1, yo, *ssk, k3, k2tog, yo, k1, k2tog, yo, k5, yo, ssk, k1, yo, repeat from * to last 13 sts, ssk, k3, k2tog, yo, k1, k2tog, yo, k3.
• Round 10: K7, yo, *ssk, k1, k2tog, yo, k13, yo, repeat from * to last 12 sts, ssk, k1, k2tog, yo, k7.
• Round 11: K4, yo, ssk, k2, yo, *sl1-k2tog-psso, yo, k2, k2tog, yo, k7, yo, ssk, k2, yo, repeat from * to last 11 sts, sl1-k2tog-psso, yo, k2, k2tog, yo, k4.