Shown with a cast-on count of 19 stitches.  

• Rounds 1-9: K19.
• Round 10: Ssk, k15, k2tog (17 sts).
• Rounds 11-28: K17.
• Round 29: Ssk, k13, k2tog (15 sts).
• Round 30: K15.
• Round 31: Ssk, k11, k2tog (13 sts).
• Rounds 32-50: K13.
• Round 51: Ssk, k9, k2tog (11 sts).
• Round 52: K11.
• Round 53: Ssk, k7, k2tog (9 sts).
• Round 54: K9.
• Round 55: Ssk, k5, k2tog (7 sts).
• Rounds 56-76: K7.
• Round 77: Ssk, k3, k2tog (5 sts).
• Round 78: K5.
• Round 79: Ssk, k1, k2tog (3 sts).
• Round 80: K3.
• Round 81: Sl1-k2tog-psso (1 st).