What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: exists x_14: P_2(x_14) <-> U_3(x_14). forall x_14: U_3(x_14).
exists x_14: P_2(x_14) -> U_3(x_14) can be inferred via the existential biconditional elimination rule. exists x_14: U_3(x_14) -> P_2(x_14) can be inferred via the existential biconditional elimination rule.