Shown with a cast-on count of 39 stitches.  

• Row 1 (RS): K8, *yo, k3tog, yo, k7, repeat from * to last 11 sts, yo, k3tog, yo, k8.
• Rows 2, 4, 6, 8, 10, and 12: Purl.
• Row 3: K1, *yo, k2, k3tog, k2, yo, k3, repeat from * to last 8 sts, yo, k2, k3tog, k2, yo, k1.
• Row 5: K2, *yo, k1, k3tog, k1, yo, k5, repeat from * to last 7 sts, yo, k1, k3tog, k1, yo, k2.
• Row 7: K3, *yo, k3tog, yo, k7, repeat from * to last 6 sts, yo, k3tog, yo, k3.
• Row 9: K2tog, k1, yo, k3, *yo, k2, k3tog, k2, yo, k3, repeat from * to last 3 sts, yo, k1, k2tog.
• Row 11: K2tog, yo, k5, *yo, k1, k3tog, k1, yo, k5, repeat from * to last 2 sts, yo, k2tog.