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_16: P_16(x_16) <-> Q_16(x_16). forall x_16: Q_3(x_16) or Q(x_16). forall x_16: Q_3(x_16) <-> P_16(x_16). exists x_16: ~Q_16(x_16).
forall x_16: P_16(x_16) -> Q_16(x_16) can be inferred via the universal biconditional elimination rule. forall x_16: Q_3(x_16) -> P_16(x_16) can be inferred via the universal biconditional elimination rule. forall x_16: Q_16(x_16) -> P_16(x_16) can be inferred via the universal biconditional elimination rule. forall x_16: P_16(x_16) -> Q_3(x_16) can be inferred via the universal biconditional elimination rule. exists x_16: ~P_16(x_16) can be inferred via the existential biconditional elimination rule.