With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Grant Gustin performed in a television series.
text_B: Berlin Dungeon is a tourist attraction from a chain including the London Dungeon and Hamburg Dungeon .. London Dungeon. London Dungeon. Hamburg Dungeon. Hamburg Dungeon. It provides a journey through Berlin 's dark history in an actor led , interactive experience .. There are both German and English shows and the actors speak German and English .
not_related.