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The Soergel category B of a Coxeter system (W,S) is a bimodule category overa polynomial algebra on which W acts. It's a categorification of the HeckeAlgebra of (W,S). In this article we give a combinatorial description ofmorphism spaces in B. As a corollary, we give an analogous description of themorphisms in O_0-proj, where O_0 is the principal block of the BGG category O.    La cat\'egorie B de Soergel d'un syst\`eme de Coxeter (W,S) est unecat\'egorie de bimodules sur une alg\`ebre de polyn\^omes sur laquelle W agit.C'est une cat\'egorification de l'alg\`ebre de Hecke de (W,S). Dans cet articlenous donnons une description combinatoire des espaces de morphismes dans B. Encorollaire, on obtient une description analogue des morphismes dans O_0-proj,o\`u O_0 est le bloc principal de la cat\'egorie O de BGG.

Sur la cat\'egorie des bimodules de Soergel