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