Shown with a cast-on count of 27 stitches.  

• Rounds 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, and 21: Knit.
• Round 2: K12, incR, k3, incL, k12 (29 sts).
• Round 4: K13, incR, k3, incL, k13 (31 sts).
• Round 6: K14, incR, k3, incL, k14 (33 sts).
• Round 8: K15, incR, k3, incL, k15 (35 sts).
• Round 10: K16, incR, k3, incL, k16 (37 sts).
• Round 12: K17, incR, k3, incL, k17 (39 sts).
• Round 14: K18, incR, k3, incL, k18 (41 sts).
• Round 16: K19, incR, k3, incL, k19 (43 sts).
• Round 18: K20, incR, k3, incL, k20 (45 sts).
• Round 20: K21, incR, k3, incL, k21 (47 sts).