With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Justin Bieber did not record Love Yourself.
text_B: Air Chief Marshal Sir John Gingell , -LRB- 3 February 1925 -- 10 December 2009 -RRB- was a senior Royal Air Force commander .. Royal Air Force. Royal Air Force. Air Chief Marshal. Air Chief Marshal
not_related.