What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? It is snowing if and only if it is overcast. It is not snowing. It is overcast or it is not windy.
If it is windy, then it is overcast. If it snows, then it is overcast. If it is overcast, then it is snowing. It is not overcast.