What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists y_1: W(y_1) or R(y_1). forall y_1: S_4(y_1) or ~R(y_1). forall y_1: W(y_1) <-> S_4(y_1).
forall y_1: R(y_1) -> S_4(y_1). forall y_1: W(y_1) -> S_4(y_1). forall y_1: S_4(y_1) -> W(y_1).