mu 1 2 3
mu 3 2 4
mu 3 4 5
mu 3 5 6
mu 6 3 7
mu 7 4 8
mu 3 8 9
mu 9 4 10
mu 1 10 11
mu 11 7 12
echo "Classes 22C 23AB 24D"
oup 3  3 12 6