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_31: Q_4(x_31) or W_4(x_31). exists x_31: ~P_31(x_31). forall x_31: W_3(x_31) -> ~W_4(x_31). forall x_31: W(x_31) -> W_3(x_31). forall x_31: P_31(x_31) <-> Q_4(x_31). forall x_31: T_3(x_31) <-> W(x_31).
forall x_31: P_31(x_31) -> Q_4(x_31) can be inferred via the universal biconditional elimination rule. forall x_31: T_3(x_31) -> W(x_31) can be inferred via the universal biconditional elimination rule. forall x_31: Q_4(x_31) -> P_31(x_31) can be inferred via the universal biconditional elimination rule. forall x_31: W(x_31) -> T_3(x_31) can be inferred via the universal biconditional elimination rule. exists x_31: ~Q_4(x_31) can be inferred via the existential biconditional elimination rule.