1
1
1
1
1
1
1
1
1
1
5
5
6
7
8
A
B
D
E
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F