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: forall x: W_3(x) -> R(x). forall x: W_3(x) -> W_4(x). forall x: ~W_4(x). forall x: R(x) -> W_3(x).
forall x: ~W_3(x) can be inferred via the universal modus tollens rule. forall x: R(x) -> W_4(x) can be inferred via the universal transitivity rule. forall x: W_3(x) <-> R(x) can be inferred via the universal biconditional introduction rule. forall x: R(x) <-> W_3(x) can be inferred via the universal biconditional introduction rule.