Shown with a cast-on count of 40 stitches.  

• Rows 1 and 19 (RS): *K7, k2tog, yo, k2, yo, ssk, k7, repeat from *.
• Rows 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20: Purl.
• Row 3: *Yo, ssk, k1, yo, sl1-k2tog-psso, yo, k8, yo, sl1-k2tog-psso, yo, k1, k2tog, yo, repeat from *.
• Row 5: *K1, k2tog, yo, k1, yo, k1, ssk, k1, k2tog, yo, yo, ssk, k1, k2tog, k1, yo, k1, yo, ssk, k1, repeat from *.
• Row 7: *K2tog, yo, k4, yo, ssk, k4, k2tog, yo, k4, yo, ssk, repeat from *.
• Row 9: *K7, yo, ssk, k2, k2tog, yo, k7, repeat from *.
• Row 11: *K7, yo, k2tog, k2, ssk, yo, k7, repeat from *.
• Row 13: *Ssk, yo, k4, yo, k2tog, k4, ssk, yo, k4, yo, k2tog, repeat from *.
• Row 15: *K1, ssk, yo, k1, yo, k1, k2tog, k1, ssk, yo, yo, k2tog, k1, ssk, k1, yo, k1, yo, k2tog, k1, repeat from *.
• Row 17: *Yo, k2tog, k1, yo, sl1-k2tog-psso, yo, k8, yo, sl1-k2tog-psso, yo, k1, ssk, yo, repeat from *.