With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Psychological horror shares some qualities with psychological thrillers.
text_B: The Editing 1984 Las Vegas AT&T Challenge of Champions was a tennis tournament held in 1984 .. It was won by John McEnroe , 7 -- 5 , 6 -- 0 against Guillermo Vilas .. John McEnroe. John McEnroe. Guillermo Vilas. Guillermo Vilas
not_related.