With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: It's Always Sunny in Philadelphia premiered on a radio station launched on June 1, 1994.
text_B: The 1987 Mr. Olympia contest was an IFBB professional bodybuilding competition held on October 31 , 1987 , at the Scandinavium in Gothenburg , Sweden .. Mr. Olympia. Mr. Olympia. IFBB. International Federation of BodyBuilders. professional bodybuilding. professional bodybuilding. Scandinavium. Scandinavium. Gothenburg. Gothenburg. Sweden. Sweden
not_related.