What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? U_2(a_5) or q. forall x_13: P_13(x_13) -> R(x_13). forall x_13: U_2(x_13) -> ~R(x_13). forall x_13: P_13(x_13) or Q_13(x_13). forall x_13: Q_13(x_13) -> R(x_13).
forall x_13: R(x_13).