The reason I'm doing it on stream is because i can have many records in memory and I want to execute this in an ordinary laptop. With streaming i can achieve this. So i set my links between a and c with 0..4 meaning each record from a can have between 0 or 4 records, same for b. But for now leta consider each record from a and b originates a record from c. With dataset api would be easy, but don't know about memory issues.
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