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. It is not snowing. If it is overcast, then it is cold. It is snowing if and only if it is windy.
It is cold can be inferred via the modus ponens rule. It is overcast and it is not snowing can be inferred via the conjunction rule. It is not snowing and it is overcast can be inferred via the conjunction rule. If it snows, then it is windy can be inferred via the biconditional elimination rule. If it is windy, then it is snowing can be inferred via the biconditional elimination rule. It is not windy can be inferred via the biconditional elimination rule.