Shown with a cast-on count of 42 stitches.  

• Rows 1-10 (RS): [K2, p2] 10 times, k2.
• Row 11 (RS): K2, M1L, [p2, k2] 9 times, p2, M1R, k2 (44 sts).
• Row 12 (RS): K2, M1L, k1, [p2, k2] 9 times, p2, k1, M1R, k2 (46 sts).
• Row 13 (RS): K2, M1L, [k2, p2] 10 times, k2, M1R, k2 (48 sts).
• Row 14 (RS): K2, M1L, p1, [k2, p2] 10 times, k2, p1, M1R, k2 (50 sts).