Shown with a cast-on count of 15 stitches.  

• Row 1 (RS): K2, yo, k2tog, k2tog, yo, k1, yo, k2tog, k2, yo, k1, yo, k3 (17 sts).
• Row 2: Yo, k2tog, k1, yo, k3, yo, k3tog, yo, k3, yo, k2tog, k1, yo, k2tog (18 sts).
• Row 3: K2, [yo, k2tog] twice, k1, k2tog, yo, k1, yo, k2tog, k2, yo, k4 (19 sts).
• Row 4: Yo, k2tog, k2, [yo, k2tog, yo, k3tog, yo, k1] twice, k1, yo, k2tog.
• Row 5: K2, [yo, k2tog] twice, k1, k2tog, yo, k1, yo, k2tog, k2, yo, k1, yo, k2tog, k2 (20 sts).
• Row 6: Yo, k2tog, k1, [yo, k3, yo, k3tog] twice, yo, k3, yo, k2tog (21 sts).
• Rows 7 and 9: K2, yo, k2tog, [k2tog, yo, k1, yo, k2tog, k1] twice, k1, yo, k2tog, k2.
• Row 8: Yo, k2tog, [k1, yo, k2tog, yo, k3tog, yo] twice, k1, yo, k2tog, k2, yo, k2tog.
• Row 10: Yo, k2tog, k2tog, [yo, k3tog, yo, k3] twice, yo, k2tog, k1, yo, k2tog (20 sts).
• Row 11: K2, yo, k2tog, [yo, k2tog, k1, k2tog, yo, k1] twice, k2tog, k2 (19 sts).
• Row 12: Yo, k2tog, k2tog, [yo, k2tog, yo, k3tog, yo, k1] twice, k1, yo, k2tog (18 sts).
• Row 13: K2, [yo, k2tog] twice, k1, k2tog, yo, k1, [yo, k2tog, k2] twice.
• Row 14: Yo, k2tog, k2tog, [yo, k3tog, yo, k3] twice, yo, k2tog (17 sts).
• Row 15: K2, yo, k2tog, k2tog, yo, k1, yo, k2tog, k1, k2tog, yo, k2tog, k3 (16 sts).
• Row 16: Yo, k2tog, k2tog, yo, k2tog, yo, k3tog, yo, k1, yo, k2tog, k2, yo, k2tog (15 sts).
• Repeat rows 1-16.