With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: London was the largest city of any in the Western Hemisphere in 2015.
text_B: FIA Formula Two Championship is the name of  :. FIA Formula Two Championship -LRB- established in 2009 -RRB- , a one-make class of auto racing for Formula Two open wheeled single seater racing cars , where all cars were serviced by Motorsport Vision .. Motorsport Vision. Motorsport Vision. FIA Formula 2 Championship , a one-make class of auto racing for Formula 2 open wheeled single seater racing cars , where cars are serviced by different teams .. FIA Formula 2 Championship. FIA Formula 2 Championship. Successor of the GP2 Series -LRB- 2005-2016 -RRB- which was established in 2017 .
not_related.