Shown with a cast-on count of 33 stitches.  

• Rounds 1, 3, 5, 7, 9, and 11-18: Knit.
• Round 2: [K2tog, k3, yo, k4, ssk] 3 times (30 sts).
• Round 4: [K2tog, k3, yo, k3, ssk] 3 times (27 sts).
• Round 6: [K2tog, k2, yo, k3, ssk] 3 times (24 sts).
• Round 8: [K2tog, k2, yo, k2, ssk] 3 times (21 sts).
• Round 10: [K2tog, k1, yo, k2, ssk] 3 times (18 sts).
• Round 19: [K2tog, k1] 6 times (12 sts).
• Round 20: [K2tog] 6 times (6 sts).