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: James is driving a car or Robert is taking a plane. If Robert takes a plane, then James is an electrician. For all x_7, x_7 will drive a car if and only if x_7 is an electrician.
For all x_7, if x_7 drives a car, then x_7 is an electrician can be inferred via the universal biconditional elimination rule. For all x_7, if x_7 were an electrician, then x_7 is driving a car can be inferred via the universal biconditional elimination rule.