or
21 21 24 24 23 23 24 24 27 27 25 25 22 22 22 22 25 25 22 22 25 25 22 22 20 20 22 22 28 28 25 25 26 26 21 21 23 23 23 23 20 20 21 21 22 22 25 25 24 24 20 21 22 23 24 25 26 27 28 29 2 4 6 8 10 12 10% 20% 30% 40% 50%