With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Pluto is in Argentina.
text_B: In mathematics , in the theory of finite groups , a Brauer tree is a tree that encodes the characters of a block with cyclic defect group of a finite group .. tree. Tree ( graph theory ). characters. Character ( group theory ). block. Block ( representation theory ). cyclic. cyclic group. defect group. defect group. finite group. finite group. In fact , the trees encode the group algebra up to Morita equivalence .. group algebra. group algebra. Morita equivalence. Morita equivalence. Such algebras coming from Brauer trees are called Brauer tree algebras .. tree. Tree ( graph theory ). described the possibilities for Brauer trees .
not_related.