3-4
2
1
A
2-3
1-2
1
B
2-4
1-2
1
A
2-4
2-3
1
A
2-4
2
1
A
1
1
F
2-3
2-3
B
5
6
3
C
4
3
1
E
3
3
C
2
2
1
A