What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: forall x_11: Q_11(x_11) -> P(x_11). ~P(a_7). forall x_11: P(x_11) <-> Q_11(x_11).
forall x_11: P(x_11) -> Q_11(x_11) can be inferred via the universal biconditional elimination rule. forall x_11: Q_11(x_11) -> P(x_11) can be inferred via the universal biconditional elimination rule.