Need to get common users for every combination of user IDs

SELECT t1.UserId, t2.UserId, COUNT(*)
FROM tab AS t1 
JOIN tab AS t2
  ON t1.UserId < t2.UserId   -- different user id 
 AND t1.UserId1 = t2.UserId1 -- same user id 1
GROUP BY 1,2

Need to get common users for every combination of user IDs - response (1) by dnoeth

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