With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Duleep Singh was nicknamed the Last Prince of Perthshire.
text_B: Backward invention is a product strategy in international marketing in which an existing product may have to be re-engineered or dumbed down by the company to be released in less developed countries , often at a cheaper rate .. product strategy. product strategy. international marketing. international marketing. dumbed down. Dumbing down. company. company. Doing so can often breathe new life into an obsolete product by the company or even target people too poor to afford the actual product .. company. company
not_related.