What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x, if x plays squash, then x is a taxi driver. For all x, x will climb a mountain if and only if x will play squash. For all x, if x were a taxi driver, then x is climbing a mountain.
For all x, if x plays squash, then x is climbing a mountain. For all x, if x climbs a mountain, then x is playing squash. For all x, if x plays squash, then x is climbing a mountain.