Shown with a cast-on count of 27 stitches.  

• Round 1: K1, yo, [k2tog, yo] twice, k2tog, k2tog, k18 (26 sts).
• Rounds 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, and 36: Knit.
• Round 3: K2tog, [yo, k2tog] 3 times, k18, yo.
• Round 5: K1, yo, k2tog, yo, k2tog, k2tog, k18, yo, k1.
• Round 7: K2tog, [yo, k2tog] twice, k18, [yo, k1] twice (27 sts).
• Round 9: K1, yo, k2tog, k2tog, k18, yo, k2tog, yo, k2tog (26 sts).
• Round 11: K2tog, yo, k2tog, k18, yo, k1, yo, k2tog, yo, k1 (27 sts).
• Round 13: K1, k2tog, k18, yo, [k2tog, yo] twice, k2tog (26 sts).
• Round 15: K2tog, k18, yo, k1, [yo, k2tog] twice, yo, k1 (27 sts).
• Round 17: K1, k18, yo, [k2tog, yo] 3 times, k2tog.
• Round 19: K18, ssk, k2tog, [yo, k2tog] twice, yo, k1 (26 sts).
• Round 21: Yo, k18, ssk, yo, [k2tog, yo] twice, k2tog.
• Round 23: K1, yo, k18, ssk, k2tog, yo, k2tog, yo, k1.
• Round 25: [K1, yo] twice, k18, ssk, yo, k2tog, yo, k2tog (27 sts).
• Round 27: K2tog, yo, k2tog, yo, k18, ssk, k2tog, yo, k1 (26 sts).
• Round 29: K1, yo, k2tog, yo, k1, yo, k18, ssk, yo, k2tog (27 sts).
• Round 31: K2tog, [yo, k2tog] twice, yo, k18, ssk, k1 (26 sts).
• Round 33: K1, yo, [k2tog, yo] twice, k1, yo, k18, ssk (27 sts).
• Round 35: K2tog, [yo, k2tog] 3 times, yo, k18, k1.