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: ~S(a_16). r_4 <-> ~T(a_16). forall y_1: S(y_1) <-> T(y_1).
r_4 -> ~T(a_16) can be inferred via the biconditional elimination rule. ~T(a_16) -> r_4 can be inferred via the biconditional elimination rule. forall y_1: S(y_1) -> T(y_1) can be inferred via the universal biconditional elimination rule. forall y_1: T(y_1) -> S(y_1) can be inferred via the universal biconditional elimination rule.