With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Margaret Osborne duPont was a female tennis player.
text_B: Margaret Osborne duPont -LRB- born Margaret Evelyn Osborne ; March 4 , 1918 -- October 24 , 2012 -RRB- was a World No. 1 American female tennis player .. tennis. tennis. DuPont won a total of 37 singles , women 's doubles , and mixed doubles Grand Slam titles , which places her fourth on the all-time list despite never entering the Australian Championships .. Grand Slam. Grand Slam ( tennis ). Australian Championships. Australian Open. She won 25 of her Grand Slam titles at the U.S. Championships , which is an all-time record .. Grand Slam. Grand Slam ( tennis ). U.S. Championships. US Open ( tennis )
related.