Shown with a cast-on count of 31 stitches.  

• Rounds 1, 3-5, 7-8, 10-11, 13, 15, and 17: Knit.
• Round 2: K7, ssk, k1 tbl, p2, k7, p2, k1 tbl, k2tog, k7 (29 sts).
• Round 6: K6, ssk, k1 tbl, p2, k7, p2, k1 tbl, k2tog, k6 (27 sts).
• Round 9: K5, ssk, k1 tbl, p2, k7, p2, k1 tbl, k2tog, k5 (25 sts).
• Round 12: K4, ssk, k1 tbl, p2, k7, p2, k1 tbl, k2tog, k4 (23 sts).
• Round 14: K3, ssk, k1 tbl, p2, k7, p2, k1 tbl, k2tog, k3 (21 sts).
• Round 16: K2, ssk, k1 tbl, p2, k7, p2, k1 tbl, k2tog, k2 (19 sts).
• Round 18: K1, ssk, k1 tbl, p2, k7, p2, k1 tbl, k2tog, k1 (17 sts).
• Round 19: Ssk, k1 tbl, p2, k7, p2, k1 tbl, k2tog (15 sts).
• Round 20: Ssk, p2, k7, p2, k2tog (13 sts).