Shown with a cast-on count of 13 stitches.  

• Row 1 (RS): K2, yo, k2tog, yo, k3, yo, ssk, k1, k2tog, yo, k1 (14 sts).
• Rows 2 and 18: P14.
• Row 3: K2, yo, k2tog, yo, k4, yo, ssk, k1, k2tog, yo, k1 (15 sts).
• Rows 4 and 16: P15.
• Row 5: K2, yo, k2tog, yo, k5, yo, ssk, k1, k2tog, yo, k1 (16 sts).
• Rows 6 and 14: P16.
• Row 7: K2, yo, k2tog, yo, k2, yo, ssk, k2, yo, ssk, k1, k2tog, yo, k1 (17 sts).
• Rows 8 and 12: P17.
• Row 9: K2, yo, k2tog, yo, k1, yo, ssk, k1, k2tog, yo, k1, yo, ssk, k1, k2tog, yo, k1 (18 sts).
• Row 10: P18.
• Row 11: K1, ssk, yo, ssk, yo, ssk, k1, yo, ssk, k2, yo, ssk, k1, k2tog, yo, k1 (17 sts).
• Row 13: K1, ssk, yo, ssk, yo, ssk, k4, yo, ssk, k1, k2tog, yo, k1 (16 sts).
• Row 15: K1, ssk, yo, ssk, yo, ssk, k3, yo, ssk, k1, k2tog, yo, k1 (15 sts).
• Row 17: K1, ssk, yo, ssk, yo, ssk, k2, yo, ssk, k1, k2tog, yo, k1 (14 sts).
• Row 19: K1, ssk, yo, ssk, yo, ssk, k1, yo, ssk, k1, k2tog, yo, k1 (13 sts).
• Row 20: P13.