1
1
1
1
1
1
1
1
1
1
1
1
1
3
5
6
6
6
8
8
A
A
B
B
C
D
D
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
F
F
F
F
F
F
F
F