Shown with a cast-on count of 40 stitches.  

• Rounds 1-6: [K2, p2] 10 times.
• Round 7: *K2tog, yo, repeat from *.
• Rounds 8-27: *K2, p2, repeat from *.
• Round 29: K2, M1L, *p2, k2, repeat from * to last 2 sts, p2, M1R (42 sts).
• Round 30: K3, *p2, k2, repeat from * to last 3 sts, p2, k1.
• Round 31: K2, M1L, k1, *p2, k2, repeat from * to last 3 sts, p2, k1, M1R (44 sts).
• Round 32: K4, *p2, k2, repeat from * to last 4 sts, p2, k2.
• Round 33: K2, M1L, k2, *p2, k2, repeat from * to last 4 sts, p2, k2, M1R (46 sts).
• Round 34: K2, p1, k2, *p2, k2, repeat from * to last 5 sts, p2, k2, p1.
• Round 35: K2, M1L, p1, k2, *p2, k2, repeat from * to last 5 sts, p2, k2, p1, M1R (48 sts).
• Round 36: K2, p2, k2, *p2, k2, repeat from * to last 6 sts, p2, k2, p2.
• Round 37: K2, M1L, p2, k2, *p2, k2, repeat from * to last 6 sts, p2, k2, p2, M1R (50 sts).
• Round 38: K2, k1, p2, k2, *p2, k2, repeat from * to last 7 sts, p2, k2, p2, k1.
• Round 39: K2, M1L, k1, p2, k2, *p2, k2, repeat from * to last 7 sts, p2, k2, p2, k1, M1R (52 sts).
• Round 40: K2, k2, p2, k2, *p2, k2, repeat from * to last 8 sts, p2, k2, p2, k2.
• Round 41: K2, M1L, k2, p2, k2, *p2, k2, repeat from * to last 8 sts, p2, k2, p2, k2, M1R (54 sts).
• Round 42: K2, p1, k2, p2, k2, *p2, k2, repeat from * to last 9 sts, p2, k2, p2, k2, p1.
• Round 43: K2, M1L, p1, k2, p2, k2, *p2, k2, repeat from * to last 9 sts, p2, k2, p2, k2, p1, M1R (56 sts).
• Round 44: K2, p2, k2, p2, k2, *p2, k2, repeat from * to last 10 sts, p2, k2, p2, k2, p2.
• Round 45: BO 4 sts, k1, p2, k2, *p2, k2, repeat from * to last 10 sts, p2, k2, p2, k1, BO 2 sts (50 sts).