Allow Parallel Booking of different service

I have 1 Staff member providing 3 services, A, B, C. 

I want to allow booking another service parallel to it but not the same. so users can book:
A & B, B& C, C & A  but not A & A. 

How do I do that? I wanted to add another staff member but How do I limit same service booking in this case? 

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