Four spins correlation function of the $q$ states Potts model, for general values of $q$. Its percolation model limit $q\to 1$

Under the assumption that the product of two spin operators decomposes uniquely into the degenerate conformal fields $\{{\mathrm{\Phi }}_{n^{\mathrm{\prime }},n}\}$, the general expression for the correlation function of four spins is defined for the $q$ states Potts model with $q$ taking general values in the interval $1 \leq q \leq 4$\mathrm{.}Thelimitof$q \rightarrow 1$ is considered in detail and the four spins function is obtained for the percolation model.