With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: South America has been colonized by multiple European countries.
text_B: The Slingsby T. 7 Kirby Cadet is a British training glider designed and built by Slingsby that first flew in 1935 and saw service with the Royal Air Force for use by the Air Training Corps as the Cadet TX .1 throughout the 1950 , 1960s and 1970s .. British. United Kingdom. glider. Glider ( sailplane ). Slingsby. Slingsby Aviation. Royal Air Force. Royal Air Force. Air Training Corps. Air Training Corps
not_related.