Shown with a cast-on count of 9 stitches.  

• Row 1 (RS): K9.
• Rows 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, and 26: Knit.
• Row 3: K3, k1, kfb, k1, k3 (10 sts).
• Row 5: K3, k2, yo, k2, k3 (11 sts).
• Row 7: K3, k2, yo, k1, yo, k2, k3 (13 sts).
• Row 9: K3, k2, yo, sl1-k2tog-psso, yo, k2, k3.
• Row 11: K3, k2, yo, k3, yo, k2, k3 (15 sts).
• Row 13: K3, k2, yo, k1, sl1-k2tog-psso, k1, yo, k2, k3.
• Row 15: K3, k2, yo, k1, yo, sl1-k2tog-psso, yo, k1, yo, k2, k3 (17 sts).
• Row 17: K3, k1, kfb, k2, sl1-k2tog-psso, k1, kfb, k2, k3.
• Row 19: K3, k2, [yo, k1] twice, sl1-k2tog-psso, [k1, yo] twice, k2, k3 (19 sts).
• Row 21: K3, k1, kfb, k3, sl1-k2tog-psso, k2, kfb, k2, k3.
• Row 23: K3, k2, yo, k1, yo, k2tog, yo, sl1-k2tog-psso, yo, k2tog, yo, k1, yo, k2, k3 (21 sts).
• Row 25: K3, k1, kfb, k4, sl1-k2tog-psso, k3, kfb, k2, k3.
• Row 27 (WS): K3, k1, kfb, k10, kfb, k2, k3 (23 sts).
• Row 28: Knit.
• Row 29: K3, k2, yo, k1, [yo, k2tog] twice, yo, sl1-k2tog-psso, [yo, k2tog] twice, yo, k1, yo, k2, k3 (25 sts).