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 x_13: T(x_13) <-> Q_1(x_13). forall x_13: T(x_13). forall x_13: W_3(x_13).
forall x_13: T(x_13) and W_3(x_13) can be inferred via the universal conjunction rule. forall x_13: W_3(x_13) and T(x_13) can be inferred via the universal conjunction rule. exists x_13: T(x_13) -> Q_1(x_13) can be inferred via the existential biconditional elimination rule. exists x_13: Q_1(x_13) -> T(x_13) can be inferred via the existential biconditional elimination rule.