Shown with a cast-on count of 15 stitches.  

• Row 1 (RS): *K1, yo, sl1-k2tog-psso, yo, k1, repeat from * to last 5 sts, k5.
• Rows 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20: Purl.
• Rows 3 and 19: K1, *k1, yo, sl1-k2tog-psso, yo, k1, repeat from * to last 4 sts, k4.
• Rows 5 and 17: K2, *k1, yo, sl1-k2tog-psso, yo, k1, repeat from * to last 3 sts, k3.
• Rows 7 and 15: K3, *k1, yo, sl1-k2tog-psso, yo, k1, repeat from * to last 2 sts, k2.
• Rows 9 and 13: K4, *k1, yo, sl1-k2tog-psso, yo, k1, repeat from * to last st, k1.
• Row 11: K5, *k1, yo, sl1-k2tog-psso, yo, k1, repeat from *.