Shown with a cast-on count of 40 stitches.  

• Rounds 1 and 9: *P1, yo, k3, ssk, k3, p3, k3, k2tog, k3, yo, repeat from *.
• Rounds 2, 4, 6, 8, 10, 12, 14, and 16: *K9, p3, k8, repeat from *.
• Rounds 3 and 11: *P1, k1, yo, k3, ssk, k2, p3, k2, k2tog, k3, yo, k1, repeat from *.
• Rounds 5 and 13: *P1, k2, yo, k3, ssk, k1, p3, k1, k2tog, k3, yo, k2, repeat from *.
• Rounds 7 and 15: *P1, k3, yo, k3, ssk, k0, p3, k0, k2tog, k3, yo, k3, repeat from *.