Shown with a cast-on count of 14 stitches.  

• Rows 1 and 3 (WS): P2, knit.
• Row 2: Purl to last 2 sts, k2.
• Row 4: Purl to last 4 sts, p2tog, k1, M1L, k1.
• Row 5: P3, knit.
• Row 6: Purl to last 5 sts, p2tog, kfb, k2.
• Row 7: P2, k1, p1, knit.
• Row 8: Purl to last 6 sts, p2tog, k1, pfb, k1, M1L, k1 (1 more st).
• Row 9: P3, k2, p1, knit.
• Row 10: Purl to last 8 sts, p2tog, k1, pfb, p1, kfb, k2 (1 more st).
• Row 11: P2, k1, p1, k3, p1, knit.
• Row 12: Purl to last 10 sts, p2tog, k1, p3, k1, pfb, k1, M1L, k1 (1 more st).
• Row 13: P3, k2, p1, k3, p1, knit.
• Row 14: Purl to last 12 sts, p2tog, k1, p3, k1, pfb, p1, kfb, k2 (1 more st).
• Row 15: P2, k1, p1, k3, p1, k3, p1, knit.
• Row 16: Purl to last 14 sts, p2tog, k1, p3, k1, p3, k1, pfb, k2.
• Row 17: P2, k2, p1, k3, p1, k3, p1, knit.
• Row 18: Purl to last 15 sts, p2tog, k1, p3, k1, p3, k1, pfb, p1, k2.
• Row 19: P2, k3, p1, k3, p1, k3, p1, knit.
• Row 20: Purl to last 16 sts, p2tog, k1, p3, k1, p3, k1, pfb, p2, k2.
• Row 21: P2, k4, p1, k3, p1, k3, p1, knit.