What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists x_12: R_1(x_12) <-> P_12(x_12). forall x_12: R_1(x_12) -> P_12(x_12). forall x_12: P_12(x_12) -> R_1(x_12). forall x_12: ~P_12(x_12).
forall x_12: ~R_1(x_12). forall x_12: R_1(x_12) <-> P_12(x_12). forall x_12: P_12(x_12) <-> R_1(x_12). exists x_12: R_1(x_12) -> P_12(x_12). exists x_12: P_12(x_12) -> R_1(x_12). exists x_12: ~R_1(x_12).