Shown with a cast-on count of 0 stitches.  

• Row 0 (RS): CO 13 sts (13 sts).
• Row 1: K2, yo, k4, yo, k2tog, k3, yo, k2 (15 sts).
• Row 2: K2, p11, k2.
• Row 3: K2, yo, k4, [yo, k2tog] twice, k3, yo, k2 (17 sts).
• Row 4: K2, p13, k2.
• Row 5: K2, yo, k4, [yo, k2tog] 3 times, k3, yo, k2 (19 sts).
• Row 6: K2, p15, k2.
• Row 7: K2, yo, k6, [yo, k2tog] twice, k5, yo, k2 (21 sts).
• Row 8: K2, p17, k2.
• Row 9: K2, yo, k8, yo, k2tog, k7, yo, k2 (23 sts).
• Row 10: K2, p19, k2.
• Row 11: K2, yo, k19, yo, k2 (25 sts).
• Row 12: K2, p21, knit.