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We discuss the relationship between modern time-dependent density functionaltheory and earlier time-periodic versions, and why the criticisms in a recentpaper (Chem. Phys. Lett. {\bf 433} (2006) 204) of our earlier analysis (Chem.Phys. Lett. {\bf 359} (2002) 237) are incorrect.

Comment on ``Analysis of Floquet formulation of time-dependent density-functional theory'' [Chem. Phys. Lett. {\bf 433} (2006), 204]