Shown with a cast-on count of 37 stitches.  

• Rows 1 and 5 (RS): K18, p1, k18.
• Rows 2 and 4: K2, p16, k1, p16, k2.
• Row 3: K2, [yo, k1] twice, yo, [ssk] 3 times, [k2tog] 3 times, [yo, k1] twice, yo, p1, [yo, k1] twice, yo, [ssk] 3 times, [k2tog] 3 times, [yo, k1] 3 times, k1.
• Rows 6 and 8: K37.
• Row 7: K2, [yo, ssk] 4 times, [k2tog, yo] 4 times, p1, [yo, ssk] 4 times, [k2tog, yo] 4 times, k2.