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In this paper, an extention of the Crank-Nicholson method for solving parabolic equations is launched. The method uses finite differences. For the derivative of the variable of time, we use central difference at 4 points (instead of 2 points of the classical Crank-Nicholson method), while for the second-order derivatives of the other spatial variables we use lagrangian interpolation at 4 points of the central differences at 5 points (instead of lagrangian interpolation at 2 points of the central differences at 3 points of the classical Crank-Nicholson method). The method is illustrated below.