instruction: Question pairs closed as the dupe of each other.
response: SELECT A.PostId AS "post_link", B.PostId AS "post_link" FROM PostLinks AS A, PostLinks AS B, Posts AS D, Posts AS O WHERE A.PostId = D.Id AND A.RelatedPostId = B.PostId AND B.RelatedPostId = A.PostId AND A.LinkTypeId = 3 AND B.LinkTypeId = 3 AND B.PostId = O.Id AND A.PostId < B.PostId ORDER BY A.PostId