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__________ ___________ ________________________
_________ ________ _________ __________
A B C D
A B C D
A
B
C
D
A
B
C
D
A
B
C
D
A B C D
A 15 B 15 30 C 30 60 D 60
A
B
C
D
1 3
A
B
C
D
E
F
G
A
B
C
D
E
F
A
B
C
D
E
A 0 3 B 4 6 C 7 10 D 10