What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_13, if x_13 sleeps, then x_13 is driving a car. There is at least one x_13 for which x_13 will not drive a car. For all x_13, x_13 will sleep or x_13 is not a mechanic. For all x_13, if x_13 drives a car, then x_13 is sleeping.
There is at least one x_13 for which x_13 will not sleep. For all x_13, if x_13 were a mechanic, then x_13 is sleeping. For all x_13, x_13 will sleep if and only if x_13 will drive a car. For all x_13, x_13 will drive a car if and only if x_13 will sleep.