trace 4.2 4.7 1 4.3 2 4.3 3 4.8 4 3.4 5 3 6 2.8 7 2.8 8 3.4 3.7 9 3.9 10 4 11 4 12 3.5 13 2.7 14 2.7 15 2.4 16