What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_2, if x_2 takes a plane, then x_2 is sleeping. For all x_2, if x_2 sleeps, then x_2 is a mechanic. For all x_2, x_2 will not take a plane. For all x_2, if x_2 were a mechanic, then x_2 is taking a plane.
For all x_2, x_2 is not a mechanic. For all x_2, if x_2 takes a plane, then x_2 is a mechanic. For all x_2, if x_2 sleeps, then x_2 is taking a plane. For all x_2, if x_2 were a mechanic, then x_2 is sleeping.