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 windy or Susan is working. Susan is working if and only if Charles is rich. Charles is rich or it is not windy.
If it is windy, then Charles is rich can be inferred via the rewriting rule. If Susan works, then Charles is rich can be inferred via the biconditional elimination rule. If Charles were rich, then Susan is working can be inferred via the biconditional elimination rule.