Shown with a cast-on count of 22 stitches.  

• Row 1 (RS): *P5, k4, repeat from * to last 4 sts, p4.
• Row 2: P1, *k4, p5, repeat from * to last 3 sts, k3.
• Row 3: K1, *p5, k4, repeat from * to last 3 sts, p3.
• Row 4: P2, *k4, p5, repeat from * to last 2 sts, k2.
• Row 5: K2, *p5, k4, repeat from * to last 2 sts, p2.
• Row 6: P3, *k4, p5, repeat from * to last st, k1.
• Row 7: K3, *p5, k4, repeat from * to last st, p1.
• Row 8: P4, *k4, p5, repeat from *.
• Row 9: K4, *p5, k4, repeat from *.
• Row 10: *P5, k4, repeat from * to last 4 sts, p4.
• Row 11: P1, *k4, p5, repeat from * to last 3 sts, k3.
• Row 12: K1, *p5, k4, repeat from * to last 3 sts, p3.
• Row 13: P2, *k4, p5, repeat from * to last 2 sts, k2.
• Row 14: K2, *p5, k4, repeat from * to last 2 sts, p2.
• Row 15: P3, *k4, p5, repeat from * to last st, k1.
• Row 16: K3, *p5, k4, repeat from * to last st, p1.
• Row 17: P4, *k4, p5, repeat from *.
• Row 18: K4, *p5, k4, repeat from *.