1
1
2
4
5
5
7
8
9
9
9
C
D
D
D
D
D
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