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 overcast. Michael is a sailor if and only if it is snowing. If Michael were a sailor, then it is snowing. If Michael were a sailor, then it is not overcast.
Michael is not a sailor can be inferred via the modus tollens rule. If Michael were a sailor, then it is snowing can be inferred via the biconditional elimination rule. If it snows, then Michael is a sailor can be inferred via the biconditional elimination rule.