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Suppose there are 4 entities, A, B, C and D. A provides its identifier to B and seeks its decision. B needs to call C providing it with the identifier of A and some other parameters so that it can arrive at some decision. Similarly, C needs to call D. And maybe so on.

Should there be a single contract or multiple contracts and between whom? Should there be a single contract among all the entities with different methods which are supposed to be called by expected entities? Or, there should be one contract between A and B, one contract between B and C, one contract between C and D and so on?

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