What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? p_2. forall x_12: P_12(x_12) -> Q_12(x_12). ~P_12(a_11). forall x_12: Q_12(x_12) -> P_12(x_12).
p_2 and ~P_12(a_11). ~P_12(a_11) and p_2. forall x_12: P_12(x_12) <-> Q_12(x_12). forall x_12: Q_12(x_12) <-> P_12(x_12).