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