13
4
3
A A A A A A A A A A A A A
A A A A A A A A A A A A A
A A A A A A A A A A A A A
A A A A A A A A A A A A A
A A A A A A A A A A A A A
A A A A A A A A A A A A A
A A A A * A A A A A A A A
A A A A A A A C C C C C C
B B B A A A C C C C C C C
B B B B A C C C C C C C C
B B B B B C C * C C C C C
B B B B B D C C C C C C C
B B B B D * D C C C C C C