1
1
1
1
1
1
1
1
1
1
1
1
2
2
5
7
7
7
8
9
A
B
B
C
C
D
D
E
E
E
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