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