Composite of Homomorphisms is Homomorphism/R-Algebraic Structure

Theorem
Let:
 * $\left({S_1, *_1}\right)_R$
 * $\left({S_2, *_2}\right)_R$
 * $\left({S_3, *_3}\right)_R$

be $R$-algebraic structures with the same number of operations.

Let:
 * $\phi: \left({S_1, *_1}\right)_R \to \left({S_2, *_2}\right)_R$
 * $\psi: \left({S_2, *_2}\right)_R \to \left({S_3, *_3}\right)_R$

be homomorphisms.

Then the composite of $\phi$ and $\psi$ is also a homomorphism.