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: If Sarah were a server, then Karen is a janitor. If it is sunny, then Sarah is a server. It is sunny or Karen is not a janitor.
If it is sunny, then Karen is a janitor can be inferred via the transitivity rule. If Karen were a janitor, then it is sunny can be inferred via the rewriting rule.