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1. What is the structure of QCD? Three ingredients: 1. coupling of gluon fields (due to non-Abelian form) 2. qq-coupling by 1gluon exchange 3. quark mass term What is the origin of the quark masses? Dynamical structure, relativistic generation of mass? Binding energies between quarks? Coupling to external Higgs field? Experimental search at LHC.