What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists y_1: Q_4(y_1). forall y_1: S(y_1) <-> Q_4(y_1). forall y_1: S(y_1) -> S_3(y_1).
forall y_1: S(y_1) -> Q_4(y_1). forall y_1: Q_4(y_1) -> S(y_1).