With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Tanya Roberts is incapable of being the stage name of Victoria Leigh Blum.
text_B: Nam Yoo-sun -LRB- also Nam Yu-seon , 남 유선 born July 23 , 1985 -RRB- is a South Korean swimmer , who specialized in individual medley events .. She is a three-time Olympian -LRB- 2000 , 2004 , and 2008 -RRB- , a fourth-place finalist at the 2002 Asian Games in Busan , and a two-time medalist in the individual medley -LRB- both 200 and 400 m -RRB- at the 2005 East Asian Games in Macau , China .. East Asian Games. East Asian Games. 2002 Asian Games. 2002 Asian Games. Busan. Busan. 2005 East Asian Games. 2005 East Asian Games. Nam became the first South Korean swimmer in history to reach an Olympic final , until Park Tae-Hwan won the nation 's first ever swimming medal at the succeeding Olympics in 2008 .. swimming. swimming ( sport ). Park Tae-Hwan. Park Tae-Hwan. Nam made her first South Korean team , as a 15-year-old , at the 2000 Summer Olympics in Sydney , where she competed in the women 's 200 m individual medley .. 2000 Summer Olympics. 2000 Summer Olympics. Sydney. Sydney. Swimming in heat two , she raced to fourth place and twenty-seventh overall by nearly five seconds behind winner Hana Cerna of the Czech Republic in 2 :22.53 .. Hana Cerna. Hana Cerna. At the 2004 Summer Olympics in Athens , Nam placed seventh in the 400 m individual medley with a time of 4 :50.35 , edging out Greece 's Vasiliki Angelopoulou by exactly half a second -LRB- 0.50 -RRB- .. 2004 Summer Olympics. 2004 Summer Olympics. Athens. Athens. 400 m individual medley. Swimming at the 2008 Summer Olympics – Women's 400 metre individual medley. Vasiliki Angelopoulou. Vasiliki Angelopoulou. Eight years after her Olympic debut , Nam qualified for her third South Korean team , as a 23-year-old , at the 2008 Summer Olympics in Beijing .. 2008 Summer Olympics. 2008 Summer Olympics. Beijing. Beijing. She eclipsed a FINA B-standard entry time of 4 :52.38 from the Dong-A Swimming Championships in Ulsan .. Ulsan. Ulsan. In the 400 m individual medley , she topped the first heat by five seconds ahead of Singapore 's Quah Ting Wen with a time of 4 :46.74 .. 400 m individual medley. Swimming at the 2008 Summer Olympics – Women's 400 metre individual medley. Quah Ting Wen. Quah Ting Wen. Nam failed to reach the top 8 final , as she placed twenty-eighth overall in the prelims .
not_related.