What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Robert is not drinking water. If Robert drinks water, then Joseph is playing tennis. If Joseph plays tennis, then Linda is taking a plane. If Linda takes a plane, then Robert is drinking water. It is raining if and only if Joseph is playing tennis.
Linda is not taking a plane. If Robert drinks water, then Linda is taking a plane. If Joseph plays tennis, then Robert is drinking water. If Linda takes a plane, then Joseph is playing tennis. If it rains, then Joseph is playing tennis. If Joseph plays tennis, then it is raining.