What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_6, x_6 is a doctor or x_6 will not work. For all x_6, if x_6 climbs a mountain, then x_6 is working. For all x_6, if x_6 were a doctor, then x_6 is climbing a mountain.
For all x_6, if x_6 were a doctor, then x_6 is working. For all x_6, if x_6 works, then x_6 is a doctor.