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