Shown with a cast-on count of 7 stitches.  

• Row 15 (RS): Yo, k2tog, [yo, k1] 5 times, yo (13 sts).
• Rows 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, and 36: Purl.
• Rows 17, 21, and 25: [Yo, k2tog] 5 times, yo, k3tog, yo.
• Rows 19 and 23: Yo, k3tog, [yo, k2tog] 5 times, yo.
• Row 27: [Yo, k1] 11 times, yo, k2tog, yo (25 sts).
• Rows 29 and 33: Yo, k3tog, [yo, k2tog] 11 times, yo.
• Rows 31 and 35: [Yo, k2tog] 11 times, yo, k3tog, yo.