Shown with a cast-on count of 25 stitches.  

• Rows 1, 3, 11, and 13 (RS): K1, *p1, k1, repeat from *.
• Rows 2, 4, 12, and 14: K1, *p1, k1, repeat from *.
• Row 5: K1, *yo, ssk, k3, k2tog, yo, k1, repeat from *.
• Rows 6, 8, 10, 16, 18, and 20: Purl.
• Row 7: K2, *yo, ssk, k1, k2tog, yo, k3, repeat from * to last 7 sts, yo, ssk, k1, k2tog, yo, k2.
• Row 9: K3, *yo, sl1-k2tog-psso, yo, k5, repeat from * to last 6 sts, yo, sl1-k2tog-psso, yo, k3.
• Row 15: K2, *k2tog, yo, k1, yo, ssk, k3, repeat from * to last 7 sts, k2tog, yo, k1, yo, ssk, k2.
• Row 17: *K1, k2tog, yo, k3, yo, ssk, repeat from * to last st, k1.
• Row 19: K2tog, *yo, k5, yo, sl1-k2tog-psso, repeat from * to last 7 sts, yo, k5, yo, ssk.