Shown with a cast-on count of 19 stitches.  

• Row 1 (RS): Yo, k2tog, k3, k2tog, yo, k3, yo, ssk, k2, yo, ssk, k3.
• Rows 2, 4, 6, 8, 10, and 12: K2tog, yo, k17.
• Row 3: Yo, k2tog, k2, k2tog, yo, k2, k2tog, yo, k1, yo, ssk, k2, yo, ssk, k2.
• Row 5: Yo, k2tog, k1, k2tog, yo, k2, k2tog, yo, k3, yo, ssk, k2, yo, ssk, k1.
• Row 7: Yo, k2tog, k2, yo, ssk, k4, yo, ssk, k3, k2tog, yo, k2.
• Row 9: Yo, k2tog, k3, yo, ssk, k1, k2tog, yo, k1, yo, ssk, k1, k2tog, yo, k3.
• Row 11: Yo, k2tog, k4, yo, sl2-k1-p2sso, yo, k3, yo, sl2-k1-p2sso, yo, k4.