With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Venus Williams does not play singles in tennis.
text_B: The Grand Slam tournaments , also called majors , are the four most-important annual tennis events .. tennis. tennis. They offer the most ranking points , prize money , public and media attention , the greatest strength and size of field , and greater number of `` best of '' sets for men .. The Grand Slam itinerary consists of the Australian Open in mid January , the French Open in May and June , Wimbledon in June and July , and the US Open in August and September .. Australian Open. Australian Open. French Open. French Open. Wimbledon. The Championships, Wimbledon. US Open. US Open ( Tennis ). Each tournament is played over a period of two weeks .. The Australian and United States tournaments are played on hard courts , the French on clay , and Wimbledon on grass .. Wimbledon. The Championships, Wimbledon. hard courts. Hardcourt. clay. Clay court. grass. Grass court. Wimbledon is the oldest , founded in 1877 , followed by the US in 1881 , the French in 1891 , and the Australian in 1905 .. Wimbledon. The Championships, Wimbledon. However , of these four , only Wimbledon was a major before 1924 -- 25 , the time when all four became designated Grand Slam tournaments .. Wimbledon. The Championships, Wimbledon. Skipping Grand Slam tournaments -- especially the Australian Open because of the remoteness , the inconvenient dates -LRB- around Christmas and New Year 's Day -RRB- and the low prize money -- was not unusual before 1982 , which was the start of the norm of counting Grand Slam titles .. Australian Open. Australian Open. The term Grand Slam also , and originally , refers to the achievement of winning all four major championships in a single calendar year within one of the five events  : men 's and women 's singles ; men 's , women 's , and mixed doubles .. In doubles , one team may accomplish a Grand Slam playing together or one player may achieve it with different partners .. The term `` Grand Slam '' without qualification refers to winning the four majors in a single calendar year .. Winning the four majors in consecutive tournaments but not in the same year is known as a Non-Calendar Year Grand Slam , while winning all four majors at any point during the course of a career is known as a Career Grand Slam .. Winning the gold medal at the Summer Olympic Games in addition to the four majors in a one calendar year is known as a `` Golden Grand Slam '' or more commonly the `` Golden Slam '' .. gold medal. Olympic medal. Summer Olympic Games. Tennis at the Summer Olympics. Also , winning the Year-End Championship -LRB- known as ATP World Tour Finals for men 's singles and doubles disciplines , and WTA Tour Championships for both women 's disciplines -RRB- in the same period is known as a `` Super Slam '' .. ATP World Tour Finals. ATP World Tour Finals. WTA Tour Championships. WTA Tour Championships. Together , all four Majors in all three disciplines -LRB- singles , doubles , and mixed doubles -RRB- are called a `` boxed set '' of Grand Slam titles .. No male or female player has won all twelve events in one calendar year , although a `` career boxed set '' has been achieved by three female players .
related.