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