With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Avril Lavigne voiced Heather in the animated comedy film, Over The Hedge.
text_B: In mathematics , especially in the field of group theory , the central product is way of producing a group from two smaller groups .. mathematics. mathematics. group theory. group theory. group. group ( mathematics ). central. center ( group theory ). The central product is similar to the direct product , but in the central product two isomorphic central subgroups of the smaller groups are merged into a single central subgroup of the product .. direct product. direct product of groups. isomorphic. isomorphism. central. center ( group theory ). subgroups. subgroups. Central products are an important construction and can be used for instance to classify extraspecial groups .
not_related.