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: Karen is not a bartender. If Karen were a bartender, then Karen is a sailor. For all x_9, x_9 is a bartender or x_9 is not a sailor.
For all x_9, if x_9 were a sailor, then x_9 is a bartender can be inferred via the universal rewriting rule.