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: U(x_11) <-> S(x_11). forall x_11: S(x_11) -> T(x_11). exists x_11: ~T(x_11).
exists x_11: ~S(x_11) can be inferred via the existential modus tollens rule. forall x_11: U(x_11) -> S(x_11) can be inferred via the universal biconditional elimination rule. forall x_11: S(x_11) -> U(x_11) can be inferred via the universal biconditional elimination rule.