Shown with a cast-on count of 30 stitches.  

• Rounds 1-2 and 11-12: *P1, k13, p1, repeat from *.
• Round 3: *P1, k10, k2tog, yo, k1, p1, repeat from *.
• Round 4: *P1, k9, k2tog, k2, yo, p1, repeat from *.
• Round 5: *P1, k8, k2tog, k1, yo, k2, p1, repeat from *.
• Round 6: *P1, k7, k2tog, k3, yo, k1, p1, repeat from *.
• Round 7: *P1, k6, k2tog, k2, yo, k3, p1, repeat from *.
• Round 8: *P1, k5, k2tog, k4, yo, k2, p1, repeat from *.
• Round 9: *P1, k4, k2tog, k3, yo, k4, p1, repeat from *.
• Round 10: *P1, k3, k2tog, k5, yo, k3, p1, repeat from *.
• Round 13: *P1, k1, yo, k2tog, k10, p1, repeat from *.
• Round 14: *P1, yo, k2, k2tog, k9, p1, repeat from *.
• Round 15: *P1, k2, yo, k1, k2tog, k8, p1, repeat from *.
• Round 16: *P1, k1, yo, k3, k2tog, k7, p1, repeat from *.
• Round 17: *P1, k3, yo, k2, k2tog, k6, p1, repeat from *.
• Round 18: *P1, k2, yo, k4, k2tog, k5, p1, repeat from *.
• Round 19: *P1, k4, yo, k3, k2tog, k4, p1, repeat from *.
• Round 20: *P1, k3, yo, k5, k2tog, k3, p1, repeat from *.