With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Richard III of England was a king.
text_B: The Fairchild C-123 Provider is an American military transport aircraft designed by Chase Aircraft and subsequently built by Fairchild Aircraft for the United States Air Force .. military transport aircraft. military transport aircraft. Chase Aircraft. Chase Aircraft. Fairchild Aircraft. Fairchild Aircraft. United States Air Force. United States Air Force. In addition to its USAF service , which included later service with the Air Force Reserve and Air National Guard , it also went on to serve most notably with the United States Coast Guard and various air forces in South East Asia .. Air Force Reserve. Air Force Reserve. Air National Guard. Air National Guard. United States Coast Guard. United States Coast Guard. During the Vietnam War , the aircraft was used to spray Agent Orange .. Agent Orange. Agent Orange
not_related.