Consider that a four-engine aircraft can land using two of its engines, while a two-engine aircraft can land using one engine. Consider also that all engines of the four-engine aircraft have the same probability of failure estimated as 0.001. Compute the probability of failure of the engines of the two-engine aircraft, so that its overall reliability is the same as that of the four-engine aircraft (the two engines of the two-engine aircraft have the same probability of failure). Assume that engine failures are independent of each other.