With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Tramadol may cause a sensation that causes the desire or reflex to scratch
text_B: In the mathematical theory of automorphic forms , the fundamental lemma relates orbital integrals on a reductive group over a local field to stable orbital integrals on its endoscopic groups .. reductive group. reductive group. local field. local field. It was conjectured by in the course of developing the Langlands program .. Langlands program. Langlands program. The fundamental lemma was proved by Gerard Laumon and Ngo Bao Chau in the case of unitary groups and then by Ngo for general reductive groups , building on a series of important reductions made by Jean-Loup Waldspurger to the case of Lie algebras .. Gerard Laumon. Gerard Laumon. Ngo Bao Chau. Ngo Bao Chau. Jean-Loup Waldspurger. Jean-Loup Waldspurger. Lie algebras. Lie algebras. Time magazine placed Ngo 's proof on the list of the `` Top 10 scientific discoveries of 2009 '' .. Time. Time ( magazine ). In 2010 , Ngo was awarded the Fields medal for this proof .. Fields medal. Fields medal
not_related.