Shown with a cast-on count of 15 stitches.  

• Rows 1, 5, and 9 (RS): *P3, k3, repeat from * to last 3 sts, p3.
• Rows 2, 6, and 10: *K3, p3, repeat from * to last 3 sts, k3.
• Rows 3, 7, and 11: *K3, p3, repeat from * to last 3 sts, k3.
• Rows 4, 8, and 12: *P3, k3, repeat from * to last 3 sts, p3.
• Rows 13, 15, 17, 19, 21, and 23: P1, k1, p1, *k1, p1, repeat from *.
• Rows 14, 16, 18, 20, 22, and 24: P1, k1, p1, *k1, p1, repeat from *.