# Context-free Grammar Exercise

Could someone explain me how to form a context-free grammar with all rules R by this example language, please? $$$$L:=\left\{w c v c \overleftarrow{w} | w, v \in\{a, b\}^{+}\right\}$$$$

I already know that $$$$\Sigma=\{a, b, c\}$$$$ and V (non terminal symbols) maybe have to be $$$$V=\{S, A, B, C\}$$$$

Thank you for helping.