Shown with a cast-on count of 7 stitches.  

• Row 1 (RS): K2, yo, [k1, yo] 3 times, k2 (11 sts).
• Row 2: K2, yo, purl to last 2 sts, yo, k2 (13 sts).
• Row 3: K2, (k1, yo, k1) in next st, knit to last 3 sts, (k1, yo, k1) in next st, k2 (17 sts).
• Row 4: K2, yo, purl to last 2 sts, yo, k2 (19 sts).
• Row 5: K2, (k1, yo, k1) in next st, knit to last 3 sts, (k1, yo, k1) in next st, k2 (23 sts).
• Row 6: K2, yo, purl to last 2 sts, yo, k2 (25 sts).
• Row 7: K2, (k1, yo, k1) in next st, knit to last 3 sts, (k1, yo, k1) in next st, k2 (29 sts).
• Row 8: K2, yo, purl to last 2 sts, yo, k2 (31 sts).
• Row 9: K2, (k1, yo, k1) in next st, knit to last 3 sts, (k1, yo, k1) in next st, k2 (35 sts).
• Row 10: K2, yo, purl to last 2 sts, yo, k2 (37 sts).
• Row 11: K2, (k1, yo, k1) in next st, knit to last 3 sts, (k1, yo, k1) in next st, k2 (41 sts).
• Row 12: K2, yo, purl to last 2 sts, yo, k2 (43 sts).