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: R_3(x) <-> Q(x). forall x: R_4(x) -> W(x). forall x: W(x) -> R_3(x).
forall x: R_4(x) -> R_3(x) can be inferred via the universal transitivity rule. exists x: R_3(x) -> Q(x) can be inferred via the existential biconditional elimination rule. exists x: Q(x) -> R_3(x) can be inferred via the existential biconditional elimination rule.