Shown with a cast-on count of 9 stitches.  

• Rows 1-8 (WS): K9.
• Row 9: K4, ctr dbl inc, k4 (11 sts).
• Row 10: K3, 1/1 LC, k1, 1/1 RC, k3.
• Row 11: K2, 1/1 RC, k3, 1/1 LC, k2.
• Row 12: K2, sl1 wyif, k5, sl1 wyif, k2.
• Rows 13-20, 22, 26, 28, and 32 (WS): K11.
• Round 21: *K9, k2tog, incR, repeat from *.
• Round 23: *K8, k2tog, incR, k1, repeat from *.
• Round 24: *K7, k2tog, incR, k2, repeat from *.
• Round 25: *K6, k2tog, incR, k3, repeat from *.
• Round 27: *K5, k2tog, incR, k4, repeat from *.
• Round 29: *K4, k2tog, incR, k5, repeat from *.
• Round 30: *K3, k2tog, incR, k6, repeat from *.
• Round 31: *K2, k2tog, incR, k7, repeat from *.
• Round 33: *K0, k2tog, incR, k9, repeat from *.
• Rounds 34 and 40: K1, 1/1 LC, k5, 1/1 RC, k1.
• Rounds 35 and 39: K2, 1/1 LC, k3, 1/1 RC, k2.
• Rounds 36-38: K3, 1/1 LC, k1, 1/1 RC, k3.