Shown with a cast-on count of 12 stitches.  

• Rows 1, 3, 7, 9, 11, 19, 31, and 33 (RS): Purl.
• Rows 2, 12, and 32: K1, *k2tog, yo, repeat from * to last st, k1.
• Rows 4, 6, 8, 14, 24, 28, 30, 34, 36, 38, and 40: Purl.
• Rows 5, 13, 21, 23, 25, 27, 29, 35, 37, and 39 (RS): Knit.
• Rows 10, 16, 18, 20, and 22: Knit.
• Row 15: K2, *MB, k3, repeat from * to last 2 sts, MB, k1.
• Row 17: K1, *yo, ssk, repeat from * to last st, k1.