With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Robert Richardson has collaborated with Errol Morris.
text_B: The seaside settlement of Karitane is located within the limits of the city of Dunedin in New Zealand , 35 kilometres to the north of the city centre .. Dunedin. Dunedin. Set in rolling country near the mouth of the Waikouaiti River , the town is a popular holiday retreat for Dunedinites .. Waikouaiti River. Waikouaiti River. Close to the settlement is the site of Huriawa Pa , which was a major fortification in pre-European New Zealand set in a strong position on a rocky promontory above the coast .. Pa ( Maori )
not_related.