Shown with a cast-on count of 71 stitches.  

• Row 1 (RS): K2, yo, ssk, k1, k2tog, k8, yo, k1, yo, k8, *sl1-k2tog-psso, k8, yo, k1, yo, k8, repeat from * to last 7 sts, ssk, k1, yo, ssk, k2.
• Rows 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20: Purl.
• Row 3: K2, k2tog, yo, k1, k2tog, k7, yo, k3, yo, k7, *sl1-k2tog-psso, k7, yo, k3, yo, k7, repeat from * to last 7 sts, ssk, k1, k2tog, yo, k2.
• Row 5: K2, yo, ssk, k1, k2tog, k6, yo, k1, yo, sl1-k2tog-psso, yo, k1, yo, k6, *sl1-k2tog-psso, k6, yo, k1, yo, sl1-k2tog-psso, yo, k1, yo, k6, repeat from * to last 7 sts, ssk, k1, yo, ssk, k2.
• Row 7: K2, k2tog, yo, k1, k2tog, k5, yo, k7, yo, k5, *sl1-k2tog-psso, k5, yo, k7, yo, k5, repeat from * to last 7 sts, ssk, k1, k2tog, yo, k2.
• Row 9: K2, yo, ssk, k1, k2tog, k4, yo, k1, yo, sl1-k2tog-psso, yo, k1, yo, sl1-k2tog-psso, yo, k1, yo, k4, *sl1-k2tog-psso, k4, yo, k1, yo, sl1-k2tog-psso, yo, k1, yo, sl1-k2tog-psso, yo, k1, yo, k4, repeat from * to last 7 sts, ssk, k1, yo, ssk, k2.
• Row 11: K2, k2tog, yo, k1, k2tog, k3, yo, k11, yo, k3, *sl1-k2tog-psso, k3, yo, k11, yo, k3, repeat from * to last 7 sts, ssk, k1, k2tog, yo, k2.
• Row 13: K2, yo, ssk, k1, k2tog, k2, yo, k1, yo, sl1-k2tog-psso, yo, k1, yo, sl1-k2tog-psso, yo, k1, yo, sl1-k2tog-psso, yo, k1, yo, k2, *sl1-k2tog-psso, k2, yo, k1, yo, sl1-k2tog-psso, yo, k1, yo, sl1-k2tog-psso, yo, k1, yo, sl1-k2tog-psso, yo, k1, yo, k2, repeat from * to last 7 sts, ssk, k1, yo, ssk, k2.
• Row 15: K2, k2tog, yo, k1, k2tog, k1, yo, k15, yo, k1, *sl1-k2tog-psso, k1, yo, k15, yo, k1, repeat from * to last 7 sts, ssk, k1, k2tog, yo, k2.
• Row 17: K2, yo, ssk, k1, k2tog, yo, k1, yo, sl1-k2tog-psso, yo, k1, yo, sl1-k2tog-psso, yo, k1, yo, sl1-k2tog-psso, yo, k1, yo, sl1-k2tog-psso, yo, k1, yo, *sl1-k2tog-psso, yo, k1, yo, sl1-k2tog-psso, yo, k1, yo, sl1-k2tog-psso, yo, k1, yo, sl1-k2tog-psso, yo, k1, yo, sl1-k2tog-psso, yo, k1, yo, repeat from * to last 7 sts, ssk, k1, yo, ssk, k2.
• Row 19: K2, k2tog, yo, k21, *k20, repeat from * to last 6 sts, k2, k2tog, yo, k2.