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Spline functions are widely used in the field of approximation theory and its applications. In this article, we propose the use of @p functions which are spline functions of degree two, as membership functions of the input variables. At first, we show by a constructive theory that multi-input-single-output (MISO) Sugeno Fuzzy Logic Systems with @p input variables membership functions are universal approximators to every continuously differentiable function defined on a compact subset of R^n. Moreover they are of first order approximation accuracy. Then, we show that with appropriately chosen parameters of the @p functions, fuzzy logic systems with @p input variables membership functions are universal approximators not only for the function itself but also for its first order derivative.