Shown with a cast-on count of 18 stitches.  

• Round 1: K18.
• Rounds 2, 5-6, 9-10, and 13-14: Knit.
• Rounds 3, 7, 11, 15, and 17: Purl.
• Round 4: *[Ssk] 3 times, [yo, k1] 6 times, yo, [k2tog] 3 times, repeat from * (19 sts).
• Round 8: *[Ssk] 3 times, [yo, k1] 7 times, yo, [k2tog] 3 times, repeat from * (21 sts).
• Round 12: *[Ssk] 3 times, k1, [yo, k1] 7 times, yo, k1, [k2tog] 3 times, repeat from * (23 sts).
• Round 16: *[Ssk] 3 times, k1, [yo, k1] 9 times, yo, k1, [k2tog] 3 times, repeat from * (27 sts).