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: P_19(x_19) -> R_10(x_19). exists x_19: P_19(x_19) <-> Q_19(x_19). forall x_19: P_6(x_19) or ~Q_2(x_19). forall x_19: P_6(x_19) -> Q_19(x_19).
forall x_19: Q_2(x_19) -> P_6(x_19) can be inferred via the universal rewriting rule. exists x_19: P_19(x_19) -> Q_19(x_19) can be inferred via the existential biconditional elimination rule. exists x_19: Q_19(x_19) -> P_19(x_19) can be inferred via the existential biconditional elimination rule.