What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists x_15: Q_15(x_15) -> P_15(x_15). forall x_15: P_15(x_15) or Q_8(x_15). forall x_15: P_15(x_15) -> Q_15(x_15). forall x_15: P_8(x_15) -> Q_15(x_15). forall x_15: P_8(x_15) <-> Q_8(x_15).
exists x_15: P_8(x_15) -> P_15(x_15). exists x_15: Q_15(x_15) <-> P_15(x_15). exists x_15: P_15(x_15) <-> Q_15(x_15). forall x_15: P_8(x_15) -> Q_8(x_15). forall x_15: Q_8(x_15) -> P_8(x_15).