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: Linda is driving a car if and only if Richard is a taxi driver. If Mary were bored, then Elisabeth is not a musician. Richard is not a taxi driver. Elisabeth is a musician.
Mary is not bored can be inferred via the modus tollens rule. Richard is not a taxi driver and Elisabeth is a musician can be inferred via the conjunction rule. Elisabeth is a musician and Richard is not a taxi driver can be inferred via the conjunction rule. If Linda drives a car, then Richard is a taxi driver can be inferred via the biconditional elimination rule. If Richard were a taxi driver, then Linda is driving a car can be inferred via the biconditional elimination rule. Linda is not driving a car can be inferred via the biconditional elimination rule.