What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists y_1: T(y_1) -> S(y_1). forall y_1: T(y_1) <-> Q_1(y_1). forall y_1: ~S(y_1). forall y_1: Q_1(y_1) or R_1(y_1).
exists y_1: ~T(y_1). forall y_1: T(y_1) -> Q_1(y_1). forall y_1: Q_1(y_1) -> T(y_1).