With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Joey Graceffa is an author and he is American.
text_B: WEC 43  : Cerrone vs. Henderson was a mixed martial arts event held by World Extreme Cagefighting on October 10 , 2009 at the AT&T Center in San Antonio , Texas .. World Extreme Cagefighting. World Extreme Cagefighting. AT&T Center. AT&T Center. mixed martial arts. mixed martial arts
not_related.