1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
4
6
8
9
9
9
B
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