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Mapping many to many relationship between 3 tables

 
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I have 3 table C, S, R
1- C might have many S and vice versa
2- S might have many R and vice versa
3- R might have many C and vice versa

I have made a relation ship which produce three tables CS, SR and RC. This is will solve to get C list which has S. the Problem is how can I get let say S list with specific C and R. This is need another table CSR but how can I get it.

Please if you can post a sample with similar situation it will be so grateful
 
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