Shown with a cast-on count of 75 stitches.  

• Rows 1, 3, 5, 7, and 9 (RS): [(K1, yo, k1) in next st, k1, [p1, k1] 10 times, k3tog] 3 times.
• Rows 2, 4, 6, 8, and 10: [P3tog, p1, [k1, p1] 10 times, (p1, yo, p1) in next st] 3 times.
• Rows 11, 13, 15, 17, and 19: [K3tog, k1, [p1, k1] 10 times, (k1, yo, k1) in next st] 3 times.
• Rows 12, 14, 16, 18, and 20: [(P1, yo, p1) in next st, p1, [k1, p1] 10 times, p3tog] 3 times.