What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If it rains, then it is sunny. It is raining or Susan is excited. If it is sunny, then it is overcast. Susan is excited if and only if it is overcast.
If it rains, then it is overcast. If Susan were excited, then it is overcast. If it is overcast, then Susan is excited.