1
1
1
1
5
6
7
8
8
9
9
A
B
C
C
D
D
D
D
E
E
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
F
F
F
F
F
F
F
F