5 5
a 3
0 0
0 1
1 0
b 5
2 0
3 0
4 0
1 1
2 1
c 8
3 1
4 1
3 2
4 2
3 3
4 3
3 4
4 4
d 4
0 2
1 2
2 2
1 3
e 5
0 3
2 3
0 4
1 4
2 4