Shown with a cast-on count of 21 stitches.  

• Row 1 (RS): K1, k2tog, yo, ssk, k3, k2tog, yo, ssk, k3, k2tog, yo, ssk, k2 (18 sts).
• Rows 2, 8, 10, and 14: P18.
• Rows 3 and 15: K2tog, yo, k1, yo, ssk, k1, k2tog, yo, k1, yo, ssk, k1, k2tog, yo, k1, yo, ssk, k1.
• Rows 4 and 16: M1R, p18 (19 sts).
• Rows 5 and 17: K1, yo, k3, yo, sl2-k1-p2sso, yo, k3, yo, sl2-k1-p2sso, yo, k3, yo, sl2-k1-p2sso.
• Rows 6 and 18: P19.
• Row 7: K2tog, k4, yo, ssk, k3, k2tog, yo, k4, ssk, M1L (18 sts).
• Row 9: K2tog, k3, yo, k1, yo, ssk, k1, k2tog, yo, k1, yo, k3, ssk, k1.
• Row 11: K2tog, k2, yo, k3, yo, sl2-k1-p2sso, yo, k3, yo, k2, ssk, k1.
• Row 12: P1, M1R, p8, M1R, p1, M1L, p8 (21 sts).
• Row 13: K2tog, k1, yo, ssk, k3, k2tog, yo, ssk, k3, k2tog, yo, k1, ssk, k1 (18 sts).