mu 1 2 3
mu 3 2 4
mu 3 4 5
mu 3 5 6
mu 4 6 7
mu 6 7 8
mu 8 7 9
mu 3 6 10
mu 6 5 11
mu 10 11 12
mu 1 11 13
mu 12 13 14
mu 5 12 15
mu 15 9 16
oup 7 12 14 16 9 3 6 7
echo "Classes 6A 9A 9B 14A 19C 26C 37D"

