Shown with a cast-on count of 45 stitches.  

• Rows 1 and 3 (RS): *P3, k3, repeat from * to last 3 sts, p3.
• Rows 2 and 4: *K3, p3, repeat from * to last 3 sts, k3.
• Rows 5 and 7: *K9, p9, repeat from * to last 9 sts, k9.
• Rows 6 and 8: *P9, k9, repeat from * to last 9 sts, p9.
• Rows 9 and 11: *K3, p3, repeat from * to last 3 sts, k3.
• Rows 10 and 12: *P3, k3, repeat from * to last 3 sts, p3.
• Rows 13 and 15: *P9, k9, repeat from * to last 9 sts, p9.
• Rows 14 and 16: *K9, p9, repeat from * to last 9 sts, k9.