Question: Formulate the following query using the Venn diagram without counting condition. Create function or views to represent the sets used in the query. Find the

Formulate the following query using the Venn diagram without counting condition. Create function or views to represent the sets used in the query. 

Find the pairs (p1, p2) of different person pids such that the person with pid p1 and the person with pid p2 knows the same number of persons. 

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