Shown with a cast-on count of 22 stitches.  

• Row 1 (RS): K1, *yo, k3, sl2-k1-p2sso, k3, yo, k1, repeat from * to last st, k1.
• Rows 2, 4, 6, 8, and 10: Purl.
• Row 3: K1, *k1, yo, k2, sl2-k1-p2sso, k2, yo, k2, repeat from * to last st, k1.
• Row 5: K1, *k2, yo, k1, sl2-k1-p2sso, k1, yo, k3, repeat from * to last st, k1.
• Row 7: K1, *k3, yo, sl2-k1-p2sso, yo, k4, repeat from * to last st, k1.
• Row 9: Knit.