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B 11 15  
C 5  10  
D 10 20

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ID   1   2   3   5   7  10  11  15  20 
A    1   1   0   0   1   1   0   1   1 
B    0   0   1   1   0   0   1   1   0 
C    0   0   0   1   1   1   0   0   0 
D    0   0   0   0   0   1   1   1   1