mu 1 2 3 mu 3 2 4 mu 3 4 5 mu 5 4 6 mu 6 1 7 mu 5 7 8 mu 4 8 9 mu 9 7 10 oup 5 10 7 6 4 8 echo "Classes 25A-E 31A-O 41A-J 20A-B'''' 25F-F''''"