With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: In 2006, Batman Begins became the first film making up a part of what would later become The Dark Knight Trilogy.
text_B: World Series of Fighting 23  : Gaethje vs. Palomino II was a mixed martial arts event to be held in Phoenix , Arizona , United States .. World Series of Fighting. World Series of Fighting. United States. United States. This event aired on NBCSN in the U.S and on Fight Network in Canada .. NBCSN. NBCSN. Fight Network. Fight Network
not_related.