Shown with a cast-on count of 31 stitches.  

• Row 1 (RS): K1, yo, *k3, k3tog, k3, yo, k1, yo, repeat from * to last 10 sts, k3, k3tog, k3, yo, k1.
• Rows 2, 4, 8, and 10: Purl.
• Row 3: P1, k1, *yo, k2, k3tog, k2, yo, k3, repeat from * to last 9 sts, yo, k2, k3tog, k2, yo, k2.
• Row 5: P1, k1, *k1, yo, k1, k3tog, k1, yo, k4, repeat from * to last 9 sts, k1, yo, k1, k3tog, k1, yo, k3.
• Row 6: P4, wrap 3 sts, p2, *p5, wrap 3 sts, p2, repeat from * to last 2 sts, p2.
• Row 7: K2tog, k1, *k2, yo, k1, yo, k3, k3tog, k1, repeat from * to last 8 sts, k2, yo, k1, yo, k3, k2tog.
• Row 9: K2tog, k1, *k1, yo, k3, yo, k2, k3tog, k1, repeat from * to last 8 sts, k1, yo, k3, yo, k2, k2tog.
• Row 11: K2tog, k1, *yo, k5, yo, k1, k3tog, k1, repeat from * to last 8 sts, yo, k5, yo, k1, k2tog.
• Row 12: P9, *wrap 3 sts, p7, repeat from * to last 2 sts, p2.