What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists y: U_2(y) <-> P(y). forall y: P(y) <-> U_2(y).
forall y: P(y) -> U_2(y). exists y: U_2(y) -> P(y). forall y: U_2(y) -> P(y). exists y: P(y) -> U_2(y).