mu 1 2 3
mu 3 2 4
mu 3 4 5
mu 3 5 6
mu 1 5 7
mu 7 6 8
mu 8 4 9
mu 1 9 10
mu 1 8 11
mu 11 6 12
mu 8 6 13
mu 13 11 14
echo "Classes 7CD 16CD 19CD 6D 8C 12B 14B 16F 28A"
oup 9   14 9 3 12 5 10 8 4 6