1
1
1
1
1
1
1
1
1
2
3
6
6
6
7
8
8
8
8
9
A
B
B
C
C
C
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