Shown with a cast-on count of 2 stitches.  

• Row 1 (RS): Yo, k1, yo, k1 (4 sts).
• Rounds 2, 4, and 6: Knit.
• Round 3: *Yo, k2, repeat from * (6 sts).
• Round 5: *Yo, k3, repeat from * (8 sts).
• Row 7 (RS): *Yo, k4, repeat from * (10 sts).
• Rows 8, 10, 12, 14, 16, 18, and 20: Knit.
• Row 9: *Yo, k5, repeat from * (12 sts).
• Row 11: *Yo, k4, yo, k2tog, repeat from * (14 sts).
• Row 13: *Yo, k7, repeat from * (16 sts).
• Row 15: *Yo, k8, repeat from * (18 sts).
• Row 17: *Yo, k9, repeat from * (20 sts).
• Row 19: *Yo, k10, repeat from * (22 sts).