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: James is a bartender or Mary is not poor. James is a bartender if and only if Mary is poor.
If Mary were poor, then James is a bartender can be inferred via the rewriting rule. If James were a bartender, then Mary is poor can be inferred via the biconditional elimination rule. If Mary were poor, then James is a bartender can be inferred via the biconditional elimination rule.