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 it is windy, then Sarah is a server. If Robert were an electrician, then Susan is a lawyer. It is windy if and only if Susan is a lawyer.
If it is windy, then Susan is a lawyer can be inferred via the biconditional elimination rule. If Susan were a lawyer, then it is windy can be inferred via the biconditional elimination rule.