What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? It is not cold. If Susan were a politician, then Barbara is a sailor. If Barbara were a sailor, then it is cold. For all x, x is a politician if and only if x will listen to a song.
Barbara is not a sailor. If Susan were a politician, then it is cold. For all x, if x were a politician, then x is listening to a song. For all x, if x listens to a song, then x is a politician.