Shown with a cast-on count of 31 stitches.  

• Rounds 1, 3, 5, and 7: K1, yo, k3, sl1-k2tog-psso, k3, yo, k1, yo, k3, sl1-k2tog-psso, k3, yo, k1, yo, k3, sl1-k2tog-psso, k3, yo, k1.
• Rounds 2, 4, 6, 8, 10, 12, 14, and 16: Knit.
• Rounds 9, 11, 13, and 15: Ssk, k3, yo, k1, yo, k3, sl1-k2tog-psso, k3, yo, k1, yo, k3, sl1-k2tog-psso, k3, yo, k1, yo, k3, k2tog.