Shown with a cast-on count of 13 stitches.  

• Row 1 (RS): K13.
• Row 2: Yo, k1, yo, knit (15 sts).
• Row 3: Yo, k1, yo, knit (17 sts).
• Row 4: Yo, k1, yo, knit (19 sts).
• Row 5: Yo, k1, yo, knit (21 sts).
• Row 6: Yo, k1, yo, knit (23 sts).
• Row 7: Yo, k1, yo, knit (25 sts).
• Row 8: Yo, k1, yo, knit (27 sts).
• Row 9: Yo, k1, [yo, k2tog, yo, k1] 8 times, k2 (36 sts).
• Row 10: Yo, k1, yo, knit (38 sts).
• Row 11: Yo, k1, yo, knit (40 sts).
• Row 12: Yo, k1, yo, knit (42 sts).
• Row 13: Yo, k1, yo, knit (44 sts).
• Row 14: Yo, k1, yo, knit (46 sts).
• Row 15: Yo, k1, yo, knit (48 sts).
• Row 16: Yo, k1, yo, knit (50 sts).
• Row 17: Yo, k1, [yo, k2tog, yo, k1] 15 times, k4 (66 sts).
• Row 18: Yo, k1, yo, knit (68 sts).
• Row 19: Yo, k1, yo, knit (70 sts).
• Row 20: Yo, k1, yo, knit (72 sts).
• Row 21: Yo, k1, yo, knit (74 sts).
• Row 22: Yo, k1, yo, knit (76 sts).
• Row 23: Yo, k1, yo, knit (78 sts).
• Row 24: Yo, k1, yo, knit (80 sts).
• Row 25: Yo, k1, [yo, k2tog, yo, k1] 25 times, k4 (106 sts).