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_19: U(x_19) and P(x_19). forall x_19: P_19(x_19) <-> Q_19(x_19). forall x_19: Q_19(x_19) or R(x_19). exists x_19: ~P_19(x_19).
forall x_19: U(x_19) can be inferred via the universal simplification rule. forall x_19: P(x_19) can be inferred via the universal simplification rule. forall x_19: P_19(x_19) -> Q_19(x_19) can be inferred via the universal biconditional elimination rule. forall x_19: Q_19(x_19) -> P_19(x_19) can be inferred via the universal biconditional elimination rule. exists x_19: ~Q_19(x_19) can be inferred via the existential biconditional elimination rule.