What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall y: T_1(y) -> R(y). exists y: R_2(y) -> T_1(y). forall y: T_3(y) <-> R(y).
exists y: R_2(y) -> R(y). forall y: T_3(y) -> R(y). forall y: R(y) -> T_3(y).