With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Star Wars: Episode II – Attack of the Clones came out on Blu-ray disc.
text_B: The 1975 Devastation Glacier landslide was a massive rock avalanche that originated from Devastation Glacier on the southern flank of the Mount Meager massif on July 22 , 1975 .. Mount Meager. Mount Meager. massif. massif. It had a volume of and buried and killed a group of four geologists at the confluence of Devastation Creek and Meager Creek .. Meager Creek. Meager Creek
not_related.