With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Rafael Nadal won an annual tennis tournament for the eighth time in 2012.
text_B: Caochangdi is an urban village and renowned arts district located in the Chaoyang District of northeast Beijing at the intersection of the 5th Ring Road and Airport Expressway .. Chaoyang District. Chaoyang District, Beijing. Beijing. Beijing. 5th Ring Road. 5th Ring Road. Translated as `` grasslands '' in Mandarin , Caochangdi is home to a diverse group of residents , including migrant workers , farmers , students and artists , most notably , Ai Weiwei .. Ai Weiwei. Ai Weiwei. Caochangdi developed into a thriving arts and cultural hub when artists began to move into the area around 2000 , attracting international attention similar to the nearby 798 Art Zone .. 798 Art Zone. 798 Art Zone
not_related.