Shown with a cast-on count of 9 stitches.  

• Rows 1 and 3 (WS): K2, yo, k2tog, k2, k2tog, yo, k1.
• Rows 2 and 4: K1, yo, k2tog, k4, yo, k2tog.
• Row 5: K2, yo, k2tog, k1, [yo] twice, k1, k2tog, yo, k1 (11 sts).
• Row 6: K1, yo, k2tog, [yo] twice, k2, p1, k3, yo, k2tog (13 sts).
• Row 7: K2, yo, [k2tog] twice, [yo] twice, k2tog, k1, p1, k2tog, yo, k1.
• Row 8: K2tog, yo, k1, k2tog, k2, p1, k2tog, k1, yo, k2tog (11 sts).
• Row 9: K2, yo, [k2tog] 3 times, k1, yo, k2tog (9 sts).
• Rows 10 and 12: K2tog, yo, k5, yo, k2tog.
• Row 11: K2, yo, k2tog, k3, yo, k2tog.