Shown with a cast-on count of 40 stitches.  

• Rows 1-2 (RS): *P1, k9, p1, k9, repeat from *.
• Row 3 (RS): *P1, k5, k2tog, yo, k2, p1, k2, yo, ssk, k5, repeat from *.
• Rows 4, 6, 8, 10, 12, and 14: *P9, k1, p9, k1, repeat from *.
• Row 5: *P1, k4, k2tog, yo, ssk, yo, k1, p1, k1, yo, k2tog, yo, ssk, k4, repeat from *.
• Row 7: *P1, k3, k2tog, yo, k1, ssk, yo, k1, p1, k1, yo, k2tog, k1, ssk, yo, k3, repeat from *.
• Row 9: *P1, k2, k2tog, yo, k2, ssk, yo, k1, p1, k1, yo, k2tog, k2, ssk, yo, k2, repeat from *.
• Row 11: *P1, k1, k2tog, yo, k3, ssk, yo, k1, p1, k1, yo, k2tog, k3, ssk, yo, k1, repeat from *.
• Row 13: *P1, k1, k2tog, yo, k1, yo, sl2-k1-p2sso, k1, yo, k1, p1, k1, yo, k1, sl2-k1-p2sso, yo, k1, yo, ssk, k1, repeat from *.