mu 1 2 3
mu 3 2 4
mu 3 4 5
mu 1 5 6
mu 6 5 7
mu 3 7 8
mu 2 3 9
mu 9 8 10
echo "Classes 4B 5A 6D  6E 6F 9A 12B"
oup 7  8 2 5 10 7 3 4