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Mathematical analysis --- Free products (Group theory) --- Geometric group theory --- HNN-extensions --- Extensions, Higman-Neumann-Neumann --- Extensions, HNN --- -Higman-Neumann-Neumann extensions --- Group extensions (Mathematics) --- Group theory --- Products, Free (Group theory) --- Extensions HNN --- Groupes, Théorie géométrique des --- Groupes, Théorie des --- Extensions HNN. --- Groupes, Théorie géométrique des. --- Groupes, Théorie des.