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: exists y_2: T(y_2) -> P(y_2). forall y_2: ~R(y_2). forall y_2: R(y_2) <-> T(y_2). forall y_2: P(y_2) -> T(y_2).
exists y_2: T(y_2) <-> P(y_2) can be inferred via the existential biconditional introduction rule. exists y_2: P(y_2) <-> T(y_2) can be inferred via the existential biconditional introduction rule. forall y_2: R(y_2) -> T(y_2) can be inferred via the universal biconditional elimination rule. forall y_2: T(y_2) -> R(y_2) can be inferred via the universal biconditional elimination rule. forall y_2: ~T(y_2) can be inferred via the universal biconditional elimination rule.