Shown with a cast-on count of 71 stitches.  

• Rows 1 and 25 (RS): K11, [k2tog, yo] twice, k8, *[k2tog, yo] 4 times, k8, repeat from * to last 16 sts, [k2tog, yo] twice, k12.
• Rows 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, and 28: K8, purl to last 8 sts, k8.
• Row 3: K10, [k2tog, yo] twice, k10, *[k2tog, yo] 3 times, k10, repeat from * to last 15 sts, k2tog, yo, k2tog, yo, k11.
• Rows 5 and 21: K11, k2tog, yo, k5, *k2tog, yo, k5, [k2tog, yo] twice, k5, repeat from * to last 21 sts, k2tog, yo, k5, k2tog, yo, k12.
• Rows 7 and 19: K10, k2tog, yo, k5, *k2tog, yo, [k2tog, yo, k5] twice, repeat from * to last 22 sts, [k2tog, yo] twice, k5, k2tog, yo, k11.
• Rows 9 and 17: K16, *[k2tog, yo] 3 times, k10, repeat from * to last 23 sts, [k2tog, yo] 3 times, k17.
• Rows 11 and 15: K15, *[k2tog, yo] 4 times, k8, repeat from * to last 24 sts, [k2tog, yo] 4 times, k16.
• Row 13: K14, *[k2tog, yo] 5 times, 3/3 RC, repeat from * to last 25 sts, [k2tog, yo] 5 times, k15.
• Row 23: K10, [k2tog, yo] twice, k10, *[k2tog, yo] 3 times, k10, repeat from * to last 15 sts, [k2tog, yo] twice, k11.
• Row 27: K10, [k2tog, yo] 3 times, 3/3 RC, *[k2tog, yo] 5 times, 3/3 RC, repeat from * to last 17 sts, [k2tog, yo] 3 times, k11.