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We describe MBM classes for irreducible holomorphic symplectic manifolds ofK3 and Kummer types. These classes are the monodromy images of extremalrational curves which give the faces of the nef cone of some birational model.We study the connection between our results and A. Bayer and E. Macr\`{\i}'stheory. We apply the numerical method of description due to E. Amerik and M.Verbitsky in low dimensions to the K3 type and Kummer type cases.

An elementary description of nef cone for irreducible holomorphic symplectic manifolds