Shown with a cast-on count of 26 stitches.  

• Row 1 (RS): K26.
• Row 2: K5, *sl1 wyib, k1, repeat from * to last 7 sts, k2tog, k5 (25 sts).
• Rows 3, 5, 7, and 9: Knit.
• Row 4: K5, k1, *sl1 wyib, k1, repeat from * to last 7 sts, k2tog, k5 (24 sts).
• Row 6: K5, *sl1 wyib, k1, repeat from * to last 7 sts, k2tog, k5 (23 sts).
• Row 8: K5, k1, *sl1 wyib, k1, repeat from * to last 7 sts, k2tog, k5 (22 sts).
• Row 10: K5, *sl1 wyib, k1, repeat from * to last 7 sts, k2tog, k5 (21 sts).