4 4
1 f h 0 b
2 b 0 h f
3 o 0 l g
4 m f l c
5 o d 0 h
6 g 0 m c
7 g 0 0 b
8 q p 0 g
9 m h 0 g
10 0 0 p c
11 0 c g l
12 c o c k
13 0 0 d m
14 b 0 0 o
15 q k g g
16 f g g l