c_6=0;
c_5=9;
c_4=6;
c_3=4;
c_2=5;
c_1=9;
c_0=0;

a = [1, -0.1*c_5, 0.1*c_4, -0.c_3];
b = [0.1*c_2, -0.1*c_1, 0.1*c_0];

%impz(b, a, 10) % opd B
stepz(b, a, 25) % opd C