Shown with a cast-on count of 25 stitches.  

• Rows 1 and 3 (WS): K25.
• Row 2: K25.
• Rows 4 and 12: K2, *k1, sl1 wyib, k1, repeat from * to last 2 sts, k2.
• Rows 5, 9, 13, and 17: K2, purl to last 2 sts, k2.
• Row 6: K1, k2tog, k1, sl1 wyib, *k2, sl1 wyib, repeat from * to last 2 sts, k2 (24 sts).
• Rows 7, 11, 15, and 19: Knit.
• Row 8: K1, k2tog, k1, *k1, sl1 wyib, k1, repeat from * to last 2 sts, k2 (23 sts).
• Row 10: K1, k2tog, *k2, sl1 wyib, repeat from * to last 2 sts, k2 (22 sts).
• Row 14: K1, k2tog, k1, sl1 wyib, *k2, sl1 wyib, repeat from * to last 2 sts, k2 (21 sts).
• Row 16: K1, k2tog, k1, *k1, sl1 wyib, k1, repeat from * to last 2 sts, k2 (20 sts).
• Row 18: K1, k2tog, *k2, sl1 wyib, repeat from * to last 2 sts, k2 (19 sts).