What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists y: T_4(y) -> W_1(y). forall y: T_1(y) -> T_4(y). forall y: W_1(y) -> T_4(y).
exists y: T_1(y) -> W_1(y). exists y: T_4(y) <-> W_1(y). exists y: W_1(y) <-> T_4(y).