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