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