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 y_3, y_3 is a sailor or y_3 is not a musician. For all y_3, if y_3 were a sailor, then y_3 is driving a car. For all y_3, if y_3 drives a car, then y_3 is a musician.
For all y_3, if y_3 were a sailor, then y_3 is a musician can be inferred via the universal transitivity rule. For all y_3, if y_3 were a musician, then y_3 is a sailor can be inferred via the universal rewriting rule.