Shown with a cast-on count of 5 stitches.  

• Row 1 (RS): K5.
• Rows 2, 4, 6, 8, 10, 14, and 18: Purl.
• Row 3: *K1, yo, repeat from * to last st, k1 (9 sts).
• Row 5: K3tog, yo, k3tog, *yo, k1, repeat from *.
• Row 7: K3tog, *yo, k1, repeat from * (13 sts).
• Row 9: K1, yo, *k3tog, yo, repeat from * to last 3 sts, k3tog (9 sts).
• Rows 12, 16, and 20: Purl.