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_8: R_8(x_8) <-> W(x_8). forall x_8: W(x_8). exists x_8: Q_8(x_8) -> R_8(x_8). forall x_8: W_4(x_8) -> Q_8(x_8).
exists x_8: W_4(x_8) -> R_8(x_8) can be inferred via the existential transitivity rule. forall x_8: R_8(x_8) -> W(x_8) can be inferred via the universal biconditional elimination rule. forall x_8: W(x_8) -> R_8(x_8) can be inferred via the universal biconditional elimination rule.