Shown with a cast-on count of 24 stitches.  

• Rows 1, 5, 9, 13, and 17 (RS): Knit.
• Rows 2, 4, 6, 8, 10, 12, 14, 16, and 18: Purl.
• Row 3: K1, [k2tog, k2, yo, k1, yo, k1, yo, k1, yo, k2, ssk] twice, k1 (28 sts).
• Row 7: K1, [k2tog, k2tog, yo, k1, yo, k1, yo, k1, yo, k1, yo, k1, yo, ssk, ssk] twice, k1 (32 sts).
• Row 11: K1, [k2tog, k2tog, k1, yo, k1, yo, k1, yo, k1, yo, k1, yo, k1, yo, k1, ssk, ssk] twice, k1 (36 sts).
• Row 15: K1, [k2tog, k2tog, k2, yo, k1, yo, k1, yo, k1, yo, k1, yo, k1, yo, k2, ssk, ssk] twice, k1 (40 sts).