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(* GNU General Public License for more details.                       *)
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(* 02110-1301 USA                                                     *)

Lemma bool_fun_zero_one_eq : ~ bool_fun_eq bool_fun_zero bool_fun_one.
Definition augment (vb : var_binding) (x : BDDvar)
(b : bool) (y : BDDvar) := if BDDvar_eq x y then b else vb y.