Shown with a cast-on count of 21 stitches.  

• Row 1 (RS): K1, p1, k1, k2, *yo, sl1-k2tog-psso, yo, k5, repeat from *.
• Rows 2, 4, 6, 8, 10, 12, 14, and 16: Kfb, purl to last 3 sts, k1, p1, k1 (1 more st).
• Row 3: K1, p1, k1, k3, *yo, ssk, k6, repeat from *.
• Rows 5, 7, 13, and 15: K1, p1, k1, knit.
• Row 9: K1, p1, k2, *k5, yo, sl1-k2tog-psso, yo, repeat from * to last 5 sts, k5.
• Row 11: K1, p1, k8, *yo, ssk, k6, repeat from *.