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 writer or x_5 will not drive a car. For all x_5, if x_5 were a bartender, then x_5 is climbing a mountain. For all x_5, if x_5 were a writer, then x_5 is a bartender.
For all x_5, if x_5 were a writer, then x_5 is climbing a mountain can be inferred via the universal transitivity rule. For all x_5, if x_5 drives a car, then x_5 is a writer can be inferred via the universal rewriting rule.