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fp coeff_dy_0_0_0, coeff_dy_p1_0_0, coeff_dy_0_p1_0, coeff_dy_p1_p1_0, coeff_dy_0_0_p1, coeff_dy_p1_0_p1, coeff_dy_0_p1_p1, coeff_dy_p1_p1_p1;