With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Prometheus entered production in 2010.
text_B: The 1989 European Cup was the 12th edition of the European Cup of athletics .. European Cup. European Cup ( athletics ). athletics. Athletics ( sport ). The Super League Finals were held in Gateshead , Great Britain .. Gateshead. Gateshead. Great Britain. Great Britain
not_related.