Shown with a cast-on count of 21 stitches.  

• Row 1 (RS): K2, k2tog, *yo, k1, yo, ssk, k3, k2tog, repeat from * to last st, yo, k1.
• Rows 2, 4, 6, 8, 10, 12, 14, and 16: Purl.
• Row 3: K1, k2tog, *yo, k3, yo, ssk, k1, k2tog, repeat from * to last 2 sts, yo, k2.
• Row 5: K2, *yo, ssk, k1, k2tog, yo, k3, repeat from * to last 3 sts, yo, ssk, k1.
• Row 7: K3, *yo, sl1-k2tog-psso, yo, k5, repeat from * to last 2 sts, yo, ssk.
• Row 9: K1, yo, *ssk, k3, k2tog, yo, k1, yo, repeat from * to last 4 sts, ssk, k2.
• Row 11: K2, yo, *ssk, k1, k2tog, yo, k3, yo, repeat from * to last 3 sts, ssk, k1.
• Row 13: K1, k2tog, yo, *k3, yo, ssk, k1, k2tog, yo, repeat from * to last 2 sts, k2.
• Row 15: K2tog, yo, *k5, yo, sl1-k2tog-psso, yo, repeat from * to last 3 sts, k3.