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 Michael were an electrician, then John is not playing tennis. John is playing tennis. It is cold if and only if Linda is a bartender. Michael is an electrician if and only if Linda is a bartender.
Michael is not an electrician can be inferred via the modus tollens rule. If it is cold, then Linda is a bartender can be inferred via the biconditional elimination rule. If Michael were an electrician, then Linda is a bartender can be inferred via the biconditional elimination rule. If Linda were a bartender, then it is cold can be inferred via the biconditional elimination rule. If Linda were a bartender, then Michael is an electrician can be inferred via the biconditional elimination rule.