What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Charles plays squash, then Susan is climbing a mountain. For all x_15, if x_15 were an office clerk, then x_15 is driving a car. Susan is climbing a mountain if and only if James is an office clerk. James is not driving a car.
If Susan climbs a mountain, then James is an office clerk. If James were an office clerk, then Susan is climbing a mountain.