Shown with a cast-on count of 4 stitches.  

• Row 1 (RS): K4.
• Row 2: P2, kfb, k1 (5 sts).
• Row 3: K3, yo, k2 (6 sts).
• Row 4: P2, kfb, k3 (7 sts).
• Row 5: K5, yo, k2 (8 sts).
• Row 6: P2, kfb, k5 (9 sts).
• Row 7: K2, (k1, yo, k1) in next st, p4, yo, k2 (12 sts).
• Row 8: P2, kfb, k4, p2tog, p3.
• Row 9: K3, yo, k1, p6, yo, k2 (14 sts).
• Row 10: P2, kfb, k6, p1, (k1, p1) in next st, p3 (16 sts).
• Row 11: K1, k2tog, k1, yo, yo, k2tog, p8, yo, k2 (17 sts).
• Row 12: P2, kfb, k8, p1, k1, p1, p3 (18 sts).
• Row 13: K2tog, ssk, yo, yo, k2tog, p10, yo, k2.
• Row 14: P2, kfb, k10, p1, (k1, p1, k1) in next st, (p1, k1) in next st, p2 (22 sts).
• Row 15: K2, p5, k1, k1, (k1, yo, k1) in next st, p1, p2tog, (k1, yo, k1) in next st, p2tog, p2, p2, yo, k2 (25 sts).
• Row 16: P2, kfb, k2, k3, p2tog, p1, k2, p2tog, p3, k5, p2 (24 sts).
• Row 17: BO 6 sts, k2tog, k2, yo, k1, p1, k2tog, yo, yo, ssk, p2, p3, yo, k2 (19 sts).
• Row 18: P2, kfb, k4, k2, p1, (k1, p1, k1) in next st, (p1, k1) in next st, p1, k1, p1, (k1, p1) in next st, p3 (24 sts).
• Row 19: K1, k2tog, k1, yo, yo, k2tog, k2tog, p5, ssk, k1, p6, yo, k2 (23 sts).
• Row 20: P2, kfb, k6, p2, k5, p1, p1, k1, p1, p3 (24 sts).
• Row 21: K2tog, ssk, yo, yo, k2tog, p1, k1, p1, k1, p1, p2tog, (k1, yo, k1) in next st, p2tog, p2, p4, yo, k2.
• Row 22: P2, kfb, k4, k3, p2tog, p1, k2, p4, p1, (k1, p1, k1) in next st, (p1, k1) in next st, p2 (27 sts).