Shown with a cast-on count of 18 stitches.  

• Row 1 (RS): Sl1 wyib, k2, [yo, k2tog] 3 times, k2, [yo, k2tog] 3 times, yo, k1 (19 sts).
• Row 2: Sl1 wyif, k10, [yo, k2tog] 3 times, k2.
• Row 3: Sl1 wyib, k2, [yo, k2tog] 3 times, k3, [yo, k2tog] 3 times, yo, k1 (20 sts).
• Row 4: Sl1 wyif, k11, [yo, k2tog] 3 times, k2.
• Row 5: Sl1 wyib, k2, [yo, k2tog] 3 times, k4, [yo, k2tog] 3 times, yo, k1 (21 sts).
• Row 6: Sl1 wyif, k12, [yo, k2tog] 3 times, k2.
• Row 7: Sl1 wyib, k2, [yo, k2tog] 3 times, k5, [yo, k2tog] 3 times, yo, k1 (22 sts).
• Row 8: Sl1 wyif, k13, [yo, k2tog] 3 times, k2.
• Row 9: Sl1 wyib, k2, [yo, k2tog] 3 times, k6, [yo, k2tog] 3 times, yo, k1 (23 sts).
• Row 10: Sl1 wyif, k14, [yo, k2tog] 3 times, k2.
• Row 11: Sl1 wyib, k2, [yo, k2tog] 3 times, k7, [yo, k2tog] 3 times, yo, k1 (24 sts).
• Row 12: Sl1 wyif, k15, [yo, k2tog] 3 times, k2.
• Row 13: Sl1 wyib, k2, [yo, k2tog] 3 times, k8, [yo, k2tog] 3 times, yo, k1 (25 sts).
• Row 14: Sl1 wyif, k16, [yo, k2tog] 3 times, k2.
• Row 15: Sl1 wyib, k2, [yo, k2tog] 3 times, k16.
• Row 16: BO 7 sts, k9, [yo, k2tog] 3 times, k2 (18 sts).
• Repeat rows 1-16.