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