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: For all x_5, x_5 is a musician if and only if x_5 will drive a car. There is at least one x_5 for which x_5 is not a musician. For all x_5, if x_5 were a musician, then x_5 is driving a car.
For all x_5, if x_5 were a musician, then x_5 is driving a car can be inferred via the universal biconditional elimination rule. For all x_5, if x_5 drives a car, then x_5 is a musician can be inferred via the universal biconditional elimination rule. There is at least one x_5 for which x_5 will not drive a car can be inferred via the existential biconditional elimination rule.