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F}\\_{2^n}^{\\ast} ,\\alpha' \\in {\\mathbb F}\\_{2^n}^{\\ast} ,\\beta \\in {\\mathbb F}\\_{2^n} \\alpha\\not=\\alpha'}} \\sharp\\{x\\in{\\mathbb F}\\_{2^n} \\mid D\\_{\\alpha,\\alpha'}^2f(x)=\\beta\\}$$where $D\\_{\\alpha,\\alpha'}^2f(x):=D\\_{\\alpha'}(D\\_{\\alpha}f(x))=f(x)+f(x+\\alpha)+f(x+\\alpha')+f(x+\\alpha+\\alpha')$ is  the second order derivative.Our purpose is to prove a 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