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