With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: To Kill a Mockingbird explores the theme of vanity.
text_B: is a sumo video game developed and published by Namcot for the Super Famicom , which was released exclusively in Japan on December 18 , 1992 .. Super Famicom. Super Famicom. sumo. sumo. Namcot. Namcot
not_related.