What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x, x is not a mechanic or x will sleep. For all x, x is not a scientist or x will play tennis. For all x, if x plays tennis, then x is driving a car. For all x, if x sleeps, then x is driving a car. For all x, x is a mechanic or x is a scientist.
For all x, x is a scientist or x will sleep.