What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: If Robert drives a car, then it is raining. If it rains, then Robert is driving a car. Robert is driving a car or William is not reading a book. It is not raining.
Robert is not driving a car can be inferred via the modus tollens rule. If William reads a book, then Robert is driving a car can be inferred via the rewriting rule. Robert is driving a car if and only if it is raining can be inferred via the biconditional introduction rule. It is raining if and only if Robert is driving a car can be inferred via the biconditional introduction rule.