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The effect of intensities of electromagnetic waves on their collisional mixing in an inert gas plasma has been investigated. For strong collisions the generated harmonic and combination frequencies in a helium plasma show a maximum (for an optimum value of wave intensity) while a continuous increase is found for weak collisions. In the presence of a static magnetic field the generation of odd harmonics is not possible with only one mode of the fundamental wave, though even harmonics can be generated if a dc electric field is present, Resonances appear at fundamental and harmonic frequencies.