What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_8, x_8 will drive a car. For all x_8, if x_8 listens to a song, then x_8 is an office clerk. For all x_8, x_8 will not take a plane. For all x_8, x_8 will take a plane or x_8 is a mechanic. For all x_8, if x_8 were a mechanic, then x_8 is an office clerk.
For all x_8, x_8 is a mechanic.