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