With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Robert Richardson has only ever collaborated with women.
text_B: Joyce Chepchumba -LRB- born 6 November 1970 in Kericho -RRB- is a long distance athlete from Kenya .. Kericho. Kericho. long distance. Long-distance track event. athlete. Athletics ( sport ). Kenya. Kenya
not_related.