Shown with a cast-on count of 18 stitches.  

• Rows 1 and 3 (RS): P1, *p3, k2, p3, repeat from * to last st, p1.
• Rows 2, 4, and 20: K1, *k3, sl2 wyif, k3, repeat from * to last st, k1.
• Row 5: P1, *p2, 1/1 RPC, 1/1 LPC, p2, repeat from * to last st, p1.
• Rows 6 and 18: K1, *k2, sl1 wyif, k2, sl1 wyif, k2, repeat from * to last st, k1.
• Row 7: P1, *p1, 1/1 RPC, p2, 1/1 LPC, p1, repeat from * to last st, p1.
• Rows 8 and 16: K1, *k1, sl1 wyif, k4, sl1 wyif, k1, repeat from * to last st, k1.
• Row 9: P1, *1/1 RPC, p4, 1/1 LPC, repeat from * to last st, p1.
• Rows 10, 12, and 14: K1, *sl1 wyif, k6, sl1 wyif, repeat from * to last st, k1.
• Rows 11 and 13: P1, *k1, p6, k1, repeat from * to last st, p1.
• Row 15: P1, *1/1 LPC, p4, 1/1 RPC, repeat from * to last st, p1.
• Row 17: P1, *p1, 1/1 LPC, p2, 1/1 RPC, p1, repeat from * to last st, p1.
• Row 19: P1, *p2, 1/1 LPC, 1/1 RPC, p2, repeat from * to last st, p1.