With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: One style of the American mandolin is the Neapolitan mandolin.
text_B: `` Chuck Versus the Gravitron '' is the eighth episode of the second season of Chuck .. Chuck. Chuck Bartowski. It was broadcast on November 24 , 2008 .. Chuck , Sarah and Casey are shocked to discover that Chuck 's girlfriend Jill is a Fulcrum agent in search of the Intersect .. Chuck. Chuck Bartowski. Sarah. Sarah Walker ( Chuck ). Casey. John Casey ( Chuck ). Jill. Jill Roberts. In the wake of his disbelief , Chuck is asked to use his relationship with Jill to get to an agent called Leader .. Chuck. Chuck Bartowski. Leader. Fulcrum ( Chuck )#Leader. Jill. Jill Roberts
not_related.