Shown with a cast-on count of 4 stitches.  

• Row 1 (RS): K2, yo, k2 (5 sts).
• Row 2: P3, yo, p2 (6 sts).
• Row 3: K2, yo, k4 (7 sts).
• Row 4: P5, yo, p2 (8 sts).
• Row 5: K2, yo, k6 (9 sts).
• Row 6: P7, yo, p2 (10 sts).
• Row 7: K2, yo, k8 (11 sts).
• Row 8: P9, yo, p2 (12 sts).
• Row 9: K2, yo, k10 (13 sts).
• Row 10: [K2tog] 5 times, k1, yo, k2 (9 sts).
• Row 11: K2, yo, k7 (10 sts).
• Row 12: P8, yo, p2 (11 sts).
• Row 13: K2, yo, k9 (12 sts).
• Row 14: P10, yo, p2 (13 sts).
• Row 15: K2, yo, k11 (14 sts).
• Row 16: P12, yo, p2 (15 sts).
• Row 17: K2, yo, k13 (16 sts).
• Row 18: P14, yo, p2 (17 sts).
• Row 19: K2, yo, k15 (18 sts).
• Row 20: [K2tog] 5 times, k6, yo, k2 (14 sts).
• Row 21: K2, yo, k12 (15 sts).
• Row 22: P13, yo, p2 (16 sts).