What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? U(f) <-> p. forall x_12: P_12(x_12) <-> Q_12(x_12). forall x_12: Q_12(x_12) <-> U(x_12). forall x_12: ~P_12(x_12).
U(f) -> p. p -> U(f). forall x_12: P_12(x_12) -> Q_12(x_12). forall x_12: Q_12(x_12) -> U(x_12). forall x_12: Q_12(x_12) -> P_12(x_12). forall x_12: U(x_12) -> Q_12(x_12). forall x_12: ~Q_12(x_12).