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 a bartender if and only if Patricia is taking a plane. Karen is a bartender or Sarah is not sleeping.
If Sarah sleeps, then Karen is a bartender can be inferred via the rewriting rule. If Karen were a bartender, then Patricia is taking a plane can be inferred via the biconditional elimination rule. If Patricia takes a plane, then Karen is a bartender can be inferred via the biconditional elimination rule.