mu 1 2 3
mu 3 2 4
mu 3 4 5
mu 3 5 6
mu 2 4 7
mu 2 6 8
mu 5 7 9
mu 4 9 10
mu 6 9 11
mu 1 9 12
mu 12 2 13
mu 1 11 14
mu 14 10 15
echo "Classes 4B 6CD 6E 9AB 12AB 4D 6G 6H 6I 8A 10A 12C"
oup 12  11 13 10 2 5 8 15 7 9 4 3 6


