Shown with a cast-on count of 48 stitches.  

• Rows 1, 3, 5, 7, 11, 13, 15, and 17 (RS): P2, [k4, p1] 8 times, k4, p2.
• Rows 2, 4, 6, 8, 10, 12, 14, 16, and 18: K2, [p4, k1] 8 times, p4, k2.
• Row 9: P48.
• Row 19: P2, k44, p2.
• Row 20: K2, p44, k2.
• Row 21: P2, k10, M1R, k4, M1L, k16, M1R, k4, M1L, k10, p2 (52 sts).
• Row 22: K2, p48, k2.
• Row 23: P2, k10, M1R, k6, M1L, k16, M1R, k6, M1L, k10, p2 (56 sts).
• Row 24: K2, p52, k2.
• Row 25: P2, k10, M1R, k8, M1L, k16, M1R, k8, M1L, k10, p2 (60 sts).
• Row 26: K2, p56, k2.
• Row 27: P2, k10, M1R, k10, M1L, k16, M1R, k10, M1L, k10, p2 (64 sts).
• Row 28: K2, p60, k2.
• Row 29: P2, k10, M1R, k12, M1L, k16, M1R, k12, M1L, k10, p2 (68 sts).
• Row 30: K2, p64, k2.
• Row 31: P2, k10, M1R, k14, M1L, k16, M1R, k14, M1L, k10, p2 (72 sts).
• Row 32: K2, p68, k2.
• Row 33: P2, k10, M1R, k16, M1L, k16, M1R, k16, M1L, k10, p2 (76 sts).
• Row 34: K2, p72, k2.
• Row 35: P2, k10, M1R, k18, M1L, k16, M1R, k18, M1L, k10, p2 (80 sts).
• Row 36: K2, p76, k2.
• Row 37: P2, k10, M1R, k20, M1L, k16, M1R, k20, M1L, k10, p2 (84 sts).
• Row 38: K2, p80, k2.
• Row 39: P2, k10, M1R, k22, M1L, k16, M1R, k22, M1L, k10, p2 (88 sts).
• Row 40: K2, p84, k2.
• Row 41: P2, k10, M1R, k24, M1L, k16, M1R, k24, M1L, k10, p2 (92 sts).
• Row 42: K2, p88, k2.
• Row 43: P2, k88, p2.
• Repeat rows 42-43.