Shown with a cast-on count of 15 stitches.  

• Rows 1 and 11 (RS): K15.
• Row 2 (RS): Yo, k3tog, [yo, k1] 9 times, yo, k3tog, yo (23 sts).
• Row 3 (RS): K23.
• Row 4 (RS): Yo, k3tog, knit to last 3 sts, k3tog, yo (21 sts).
• Row 5 (RS): K21.
• Row 6 (RS): Yo, k3tog, knit to last 3 sts, k3tog, yo (19 sts).
• Row 7 (RS): K19.
• Row 8 (RS): Yo, k3tog, knit to last 3 sts, k3tog, yo (17 sts).
• Row 9 (RS): K17.
• Row 10 (RS): Yo, k3tog, knit to last 3 sts, k3tog, yo (15 sts).