mu 1 2 3
mu 3 2 4
mu 3 4 5
mu 3 5 6
mu 6 5 7
pwr 3 3 8
mu 8 5 9
mu 3 9 10
mu 1 1 11
mu 2 2 12
mu 3 6 13
pwr 3 10 14
pwr 3 7 15
mu 9 4 16
mu 3 7 17
echo "Classes 1A 2A 4A 4B 5A 7ABC 13ABC 3A 6A 12A 12B 15A 3A' 6A' 12A' 12B' 15A'"
oup 17  11 1 14 15 8 9 5  2 6 7 10 3  12 13 16 17 4