With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Josh Hartnett is an actor.
text_B: Air Ambulance Show is an international fair of integrated emergency systems for professionals and general public .. fair. fair. The fair takes place every year in May in Hradec Kralove in the Czech Republic .. Hradec Kralove. Hradec Kralove. Czech Republic. Czech Republic. fair. fair
not_related.