1
1
1
1
1
3
4
4
5
5
5
7
7
8
8
9
A
B
B
C
C
D
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