mu 1 2 3
mu 3 2 4
mu 3 4 5
mu 5 4 6
mu 3 6 7
mu 3 7 8
mu 3 8 9
mu 5 6 10
mu 10 4 11
mu 3 11 12
mu 3 12 13
pwr 9 13 14
mu 9 4 15
mu 15 4 16
pwr 23 16 17
mu 7 16 18
mu 3 5 19
mu 8 19 20
mu 8 20 21

echo "Classes 7IJK 14ACE 63ACE 73ACE 9D 12A 21G"
oup 7   21 18 17 14 9 2 3