With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: There is a video sharing website called Youtube.
text_B: There were a total of six bids which were initially submitted for the 2020 Summer Olympics .. 2020 Summer Olympics. 2020 Summer Olympics. Tokyo was ultimately elected as the host city at the 125th IOC Session in Buenos Aires , Argentina on September 7 , 2013 .. Tokyo. Tokyo. 125th IOC Session. 125th IOC Session. Buenos Aires. Buenos Aires. Argentina. Argentina
not_related.