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: It is sunny. For all y_3, if y_3 were a doctor, then y_3 is a taxi driver. Karen is an electrician or Sarah is a doctor. If Karen were an electrician, then Sarah is a taxi driver.
If Sarah were a bartender, then Karen is an electrician can be inferred via the rewriting rule.