mu 1 2 3
mu 3 2 4
mu 3 4 5
mu 3 5 6
mu 6 3 7
mu 7 4 8
mu 7 8 9
mu 7 9 10
mu 2 9 11
mu 2 11 12
echo "Classes 4C 6B 8A 12A 14A 15A 21B 31B"
oup 8   11 12 7 10 9 8 3 4

