With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Colombia isn't the country with the second-highest biodiversity in the world.
text_B: The Melling Hellcat is a concept sports car designed by Al Melling to be the fastest street legal car in the world .. sports car. sports car. Al Melling. Al Melling. It was introduced in February 2007 and was scheduled to come out in 2012 .. The car is powered by a 6.0 litre quad-turbo V10 Engine giving it 1217 hp , higher than that of the current fastest street-legal car , the Bugatti Veyron Super Sport .. V10. V10 engine. Bugatti Veyron Super Sport. Bugatti Veyron Super Sport. The prototype of this car was produced in 2006 .. As of April 2017 , the car is still not in production .
not_related.