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We determine the Lie algebras of infinitesimal automorphisms for the modelsof the CR-manifolds belonging to general classes ${\sf II}$, ${\sf III_2}$ and${\sf IV_2}$ through Cartan's equivalence method.

Lie algebras of infinitesimal automorphisms for the model manifolds of general classes ${\sf II}$, ${\sf III_2}$ and ${\sf IV_2}$