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A complete description of $Q$-conditional symmetries ofreaction-diffusion-convection equation with arbitrary power nonlinearities isfinished. It is shown that the results obtained in the first and second partsof this work (see arXiv:math-ph/0612078 and arXiv:0706.0814) cannot be extendedon new power nonlinearities arising in the diffusion and convectioncoefficients.

New conditional symmetries and exact solutions of nonlinear reaction-diffusion-convection equations. III