mu 1 2 3
mu 3 2 4
mu 4 2 5
mu 5 2 6
mu 4 5 7
mu 3 6 8
mu 3 5 9
mu 7 5 10
mu 3 9 11
mu 4 10 12
oup 10 10 12 11 9 4 6 3 5 7 8
echo "Classes 4C  6B  7D 8A 8B 12A 13A 18C 21C 28A"