3
3
4 3
A B C
D E F
G H I
J K L
3
5 7
A B A B A B A
A B A B A B A
A B C B A C A
A B C B A C A
A B A B A B A
5
3 7
A B B C B B A
B C C B C C B
A B B C B A A
