What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? It is not raining. Barbara is driving a car if and only if Thomas is a mechanic. If it is sunny, then Barbara is driving a car. It is raining if and only if it is sunny. If Barbara drives a car, then it is sunny.
It is sunny if and only if Barbara is driving a car. Barbara is driving a car if and only if it is sunny. If Barbara drives a car, then Thomas is a mechanic. If it rains, then it is sunny. If Thomas were a mechanic, then Barbara is driving a car. If it is sunny, then it is raining. It is not sunny.