What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Barbara drives a car, then Sarah is running. James is not a mechanic. If Sarah goes running, then Barbara is driving a car. If Barbara drives a car, then James is a mechanic. If James were a mechanic, then Barbara is driving a car.
Barbara is not driving a car. If Sarah goes running, then James is a mechanic. If James were a mechanic, then Sarah is running. Barbara is driving a car if and only if Sarah is running. Sarah is running if and only if Barbara is driving a car. Barbara is driving a car if and only if James is a mechanic. James is a mechanic if and only if Barbara is driving a car.