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_14: Q(x_14) <-> S(x_14). exists x_14: P_14(x_14) -> R_2(x_14). forall x_14: P_14(x_14) -> Q(x_14). forall x_14: Q(x_14) -> P_14(x_14).
exists x_14: Q(x_14) -> R_2(x_14) can be inferred via the existential transitivity rule. forall x_14: P_14(x_14) <-> Q(x_14) can be inferred via the universal biconditional introduction rule. forall x_14: Q(x_14) <-> P_14(x_14) can be inferred via the universal biconditional introduction rule. forall x_14: Q(x_14) -> S(x_14) can be inferred via the universal biconditional elimination rule. forall x_14: S(x_14) -> Q(x_14) can be inferred via the universal biconditional elimination rule.