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_6: T(x_6) -> Q_6(x_6). forall x_6: R_6(x_6) <-> Q_3(x_6). exists x_6: Q_6(x_6) -> R_6(x_6).
exists x_6: T(x_6) -> R_6(x_6) can be inferred via the existential transitivity rule. forall x_6: R_6(x_6) -> Q_3(x_6) can be inferred via the universal biconditional elimination rule. forall x_6: Q_3(x_6) -> R_6(x_6) can be inferred via the universal biconditional elimination rule.