Shown with a cast-on count of 3 stitches.  

• Round 1: Yo, k3, yo (5 sts).
• Rounds 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20: Knit.
• Round 3: Yo, k5, yo (7 sts).
• Round 5: Yo, k2tog, yo, sl2-k1-p2sso, yo, ssk, yo.
• Round 7: Yo, k2, yo, k3, yo, k2, yo (11 sts).
• Round 9: Yo, k3, yo, k5, yo, k3, yo (15 sts).
• Round 11: Yo, k4, yo, k2tog, yo, sl2-k1-p2sso, yo, ssk, yo, k4, yo (17 sts).
• Round 13: Yo, k5, yo, k2, yo, k3, yo, k2, yo, k5, yo (23 sts).
• Round 15: Yo, k6, yo, k3, yo, k5, yo, k3, yo, k6, yo (29 sts).
• Round 17: Yo, k7, yo, k4, yo, k7, yo, k4, yo, k7, yo (35 sts).
• Round 19: Yo, k6, k2tog, yo, k5, yo, k9, yo, k5, yo, ssk, k6, yo (39 sts).