With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Bill Gates is a charity worker.
text_B: PBY Catalina Survivors identifies Catalinas on display , and includes aircraft designations , status , serial numbers , locations and additional information .. The Consolidated PBY Catalina was a twin-engined American flying boat of the 1930s and 1940s , designed by Consolidated Aircraft Co. .. Consolidated PBY Catalina. Consolidated PBY Catalina. flying boat. flying boat. Consolidated Aircraft. Consolidated Aircraft. Several variants were built at five US and Canadian manufacturing plants .
not_related.