Shown with a cast-on count of 21 stitches.  

• Row 1 (RS): K1, *k2, yo, k2tog, k1, ssk, yo, k3, repeat from *.
• Rows 2, 6, and 10: *P3, k2, p1, k2, p2, repeat from * to last st, p1.
• Rows 3 and 7: K1, *k2tog, yo, k1, p3, k1, yo, ssk, k1, repeat from *.
• Rows 4 and 8: *P4, k1, p1, k1, p3, repeat from * to last st, p1.
• Rows 5 and 9: K1, *k1, p1, yo, p1, sl2-k1-p2sso, p1, yo, p1, k2, repeat from *.