Verify if the process y_k = 0.6y_k-1 - 0.08y_k-2 + e_k has unit root. If it does, modify the coefficient a_2 so that it does not. If the process does not have unit root, modify a_2 so that it has unit root. Draw graphs of both processes with y_0 = 1 and e_k uniformly distributed on the interval [-0.5, 0.5].