With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: RB Leipzig is based in the largest city in Brandenburg.
text_B: Casey Jones , also known as Casey Jones  : The Movie , is a short fan film written , filmed , edited and directed by Polaris Banks based on the Teenage Mutant Ninja Turtles characters .. short. short film. fan film. fan film. Teenage Mutant Ninja Turtles. Teenage Mutant Ninja Turtles. The film premiered August 14 , 2011 in Austin , Texas at the Marchesa Hall & Theater , and on the internet on September 18 , 2011 .. internet. internet
not_related.