What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If John climbs a mountain, then James is poor. If James were poor, then John is climbing a mountain. Barbara is an office clerk if and only if James is poor. If it is overcast, then Barbara is an office clerk. For all x, x will not climb a mountain.
If Barbara were an office clerk, then James is poor. If James were poor, then Barbara is an office clerk.