With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: UFC 216 will be held in September.
text_B: UFC 216 is an upcoming mixed martial arts event produced by the Ultimate Fighting Championship that will be held on September 9 , 2017 at Rogers Place in Edmonton , Alberta .. Ultimate Fighting Championship. Ultimate Fighting Championship. Rogers Place. Rogers Place. mixed martial arts. mixed martial arts
related.