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_12: ~Q_7(x_12). exists x_12: R_1(x_12) <-> Q_7(x_12). forall x_12: R_1(x_12) <-> S(x_12).
forall x_12: R_1(x_12) -> S(x_12) can be inferred via the universal biconditional elimination rule. exists x_12: R_1(x_12) -> Q_7(x_12) can be inferred via the existential biconditional elimination rule. forall x_12: S(x_12) -> R_1(x_12) can be inferred via the universal biconditional elimination rule. exists x_12: Q_7(x_12) -> R_1(x_12) can be inferred via the existential biconditional elimination rule. exists x_12: ~R_1(x_12) can be inferred via the existential biconditional elimination rule.