Shown with a cast-on count of 22 stitches.  

• Rows 1 and 19 (RS): Knit.
• Rows 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20: Purl.
• Row 3: *K3, yo, ssk, k6, repeat from *.
• Row 5: *K4, yo, ssk, k5, repeat from *.
• Row 7: *K5, yo, ssk, k4, repeat from *.
• Rows 9 and 13: *K3, k2tog, yo, k1, yo, ssk, k3, repeat from *.
• Rows 11 and 15: *K2, k2tog, yo, k3, yo, ssk, k2, repeat from *.
• Row 17: *K4, yo, sl1-k2tog-psso, yo, k4, repeat from *.
• Repeat rows 1-18.