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