With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Adderall shares three chemical properties with the human trace amines.
text_B: The 1991 UEFA Cup Final was an all-Italian football tie played on 8 May 1991 and 22 May 1991 between Internazionale and Roma .. Internazionale. F.C. Internazionale Milano. Roma. A.S. Roma. football. association football. Inter won 2 -- 1 on aggregate after winning the first leg 2 -- 0 but losing the second 1 -- 0 .
not_related.