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: Q_13(x_13) -> T_4(x_13). forall x_13: P_13(x_13) <-> Q_13(x_13). forall x_13: T_4(x_13) -> P_13(x_13). forall x_13: P_5(x_13) <-> T_4(x_13). forall x_13: ~P_5(x_13).
exists x_13: Q_13(x_13) -> P_13(x_13) can be inferred via the existential transitivity rule. forall x_13: P_13(x_13) -> Q_13(x_13) can be inferred via the universal biconditional elimination rule. forall x_13: P_5(x_13) -> T_4(x_13) can be inferred via the universal biconditional elimination rule. forall x_13: Q_13(x_13) -> P_13(x_13) can be inferred via the universal biconditional elimination rule. forall x_13: T_4(x_13) -> P_5(x_13) can be inferred via the universal biconditional elimination rule. forall x_13: ~T_4(x_13) can be inferred via the universal biconditional elimination rule.