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_13: P_13(x_13) or Q_13(x_13). forall x_13: P_13(x_13) -> R_13(x_13). forall x_13: Q_13(x_13) -> R_13(x_13). w.
forall x_13: R_13(x_13) can be inferred via the universal disjunction elimination rule.