Shown with a cast-on count of 39 stitches.  

• Row 1 (RS): Drop st, p2, k25, p2, k2, p1, k2, p2, k2 (38 sts).
• Row 2: P2, k2, p2, k1, p2, k2, p25, k2.
• Row 3: Drop st, p1, k25, p2, k2, p1, k2, p2, k2 (37 sts).
• Row 4: P2, k2, 2/1/2 LC, k2, p25, k1.
• Row 5: Drop st, k25, p2, k2, p1, k2, p2, k2 (36 sts).
• Row 6: P2, k2, p2, k1, p2, k2, p25.
• Row 7: K25, p2, k2, p1, k2, p2, k2.
• Row 8: P2, k2, 2/1/2 LC, k2, p25.
• Row 9: Drop st, k24, p2, k2, p1, k2, p2, k2 (35 sts).
• Row 10: P2, k2, p2, k1, p2, k2, p24.
• Row 11: K24, p2, k2, p1, k2, p2, k2.
• Row 12: P2, k2, 2/1/2 LC, k2, p24.
• Row 13: Drop st, k23, p2, k2, p1, k2, p2, k2 (34 sts).
• Row 14: P2, k2, p2, k1, p2, k2, p23.
• Row 15: K23, p2, k2, p1, k2, p2, k2.
• Row 16: P2, k2, 2/1/2 LC, k2, p23.
• Row 17: Drop st, k22, p2, k2, p1, k2, p2, k2 (33 sts).
• Rows 18 and 22: P2, k2, p2, k1, p2, k2, p22.
• Rows 19, 21, and 23: K22, p2, k2, p1, k2, p2, k2.
• Rows 20 and 24: P2, k2, 2/1/2 LC, k2, p22.
• Row 25: K22, p2, k2, p1, k2, p2, kfb, k1 (34 sts).
• Rows 26 and 28: P3, k2, p2, k1, p2, k2, p22.
• Row 27: K22, p2, 2/1/2 RC, p2, k3.
• Row 29: K22, p2, k2, yo, p1, yo, k2, p2, k3 (36 sts).
• Row 30: P3, k2, p2, k3, p2, k2, p22.
• Row 31: K22, p2, 2/1 LPC, p1, 2/1 RPC, p2, k3.
• Rows 32 and 34: P3, k3, p2, k1, p2, k3, p22.
• Row 33: K22, p3, 2/1/2 LPC, p3, k3.
• Row 35: K22, p2, w&t (24 sts).
• Row 36: K2, p22.
• Row 37: K22, w&t (22 sts).
• Row 38: P22.
• Row 39: K20, w&t (20 sts).
• Rows 40 and 42: P20.
• Row 41: K20, [drop st] 16 times.
• Row 43: K20.
• Row 44: Drop st, p19 (19 sts).
• Rows 45 and 47: K19.
• Row 46: P19.
• Row 48: Drop st, p18 (18 sts).
• Rows 49 and 51: K18.
• Row 50: P18.
• Row 52: Drop st, p17 (17 sts).
• Rows 53 and 55: K17.
• Row 54: P17.
• Row 56: P11, w&t (11 sts).
• Row 57: K11.
• Row 58: P5, w&t (5 sts).
• Row 59: K5.