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We perform a complete decoupling of the degrees of freedom of quadraticgravity and the generic $f (R_{\mu\nu\sigma \rho})$ theory about any one oftheir possible vacua, i.e. maximally symmetric solution, find the masses of thespin-2 and spin-0 modes in explicit forms.

Particle Content of Quadratic and $f(R_{\mu\nu\sigma \rho})$ Theories in $(A)dS$