Shown with a cast-on count of 84 stitches.  

• Row 1 (RS): K3, k2tog, yo, k1, [yo, sl1-k2tog-psso, yo, k3] 12 times, k1, yo, k2tog, p3.
• Rows 2 and 4: K3, p78, p3.
• Row 3: K3, k2tog, yo, k1, [k3, yo, sl1-k2tog-psso, yo] 12 times, k1, yo, k2tog, p3.
• Row 5: K3, k2tog, yo, [k2tog, k1, k2tog, k1] 12 times, k2tog, yo, k2tog, p3 (59 sts).
• Row 6: K3, p53, p3.
• Row 7: K3, k2tog, yo, [sl1-k2tog-psso, yo, k1, yo] 11 times, sl1-k2tog-psso, yo, k2tog, yo, k2tog, p3 (57 sts).
• Row 8: K3, p51, p3.
• Row 9: K3, k2tog, yo, k1, [yo, k2tog] 23 times, yo, k2tog, p3.
• Row 10: K3, p49, p2, p3.
• Row 11: K3, k2tog, yo, [k2tog] 22 times, k3tog, yo, k2tog, p3 (33 sts).
• Row 12: K3, p30.
• Row 13: K3, k2tog, yo, [k2tog, k1, k2tog] twice, sl1-k2tog-psso, [k2tog, k1, k2tog] twice, yo, k2tog, p3 (23 sts).
• Row 14: K3, p2, k13, p2, p3.
• Row 15: K3, k2tog, yo, p13, yo, k2tog, p3.
• Row 16: K3, p17, p3.
• Row 17: K3, k2tog, yo, [sl1-k2tog-psso] twice, yo, k1, yo, [sl1-k2tog-psso] twice, yo, k2tog, p3 (17 sts).
• Row 18: K3, p11, p3.