Shown with a cast-on count of 9 stitches.  

• Row 1 (WS): K3, p3, k3.
• Row 2: K3, M1L, k1, M1R, k1, M1L, k1, M1R, k3 (13 sts).
• Rows 3, 5, 7, 9, 11, and 13: K3, purl to last 3 sts, k3.
• Row 4: K3, M1L, k3, M1R, k1, M1L, k3, M1R, k3 (17 sts).
• Row 6: K3, M1L, k5, M1R, k1, M1L, k5, M1R, k3 (21 sts).
• Row 8: K3, M1L, k7, M1R, k1, M1L, k7, M1R, k3 (25 sts).
• Row 10: K3, M1L, k9, M1R, k1, M1L, k9, M1R, k3 (29 sts).
• Row 12: K3, M1L, k11, M1R, k1, M1L, k11, M1R, k3 (33 sts).
• Row 14: K3, M1L, k13, M1R, k1, M1L, k13, M1R, k3 (37 sts).