Shown with a cast-on count of 37 stitches.  

• Row 1 (RS): K4, *k2tog, yo, k1, yo, ssk, k7, repeat from * to last 9 sts, k2tog, yo, k1, yo, ssk, k4.
• Rows 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20: Purl.
• Row 3: K3, *k2tog, yo, k3, yo, ssk, k5, repeat from * to last 10 sts, k2tog, yo, k3, yo, ssk, k3.
• Row 5: K2, *k2tog, yo, k5, yo, ssk, k3, repeat from * to last 11 sts, k2tog, yo, k5, yo, ssk, k2.
• Row 7: K1, *k2tog, yo, k7, yo, ssk, k1, repeat from *.
• Row 9: K2tog, yo, *k1, 4/3 LC, k1, yo, sl1-k2tog-psso, yo, repeat from * to last 11 sts, k1, 4/3 LC, k1, yo, ssk.
• Row 11: K1, *yo, ssk, k7, k2tog, yo, k1, repeat from *.
• Row 13: K2, *yo, ssk, k5, k2tog, yo, k3, repeat from * to last 11 sts, yo, ssk, k5, k2tog, yo, k2.
• Row 15: K3, *yo, ssk, k3, k2tog, yo, k5, repeat from * to last 10 sts, yo, ssk, k3, k2tog, yo, k3.
• Row 17: K4, *yo, ssk, k1, k2tog, yo, k7, repeat from * to last 9 sts, yo, ssk, k1, k2tog, yo, k4.
• Row 19: K5, *yo, sl1-k2tog-psso, yo, k1, 4/3 RC, k1, repeat from * to last 8 sts, yo, sl1-k2tog-psso, yo, k5.
• Repeat rows 1-20.