(***************************************************************************)
(* Formalization of the Chou, Gao and Zhang's decision procedure.          *)
(* Julien Narboux (Julien@narboux.fr)                                      *)
(* LIX/INRIA FUTURS 2004-2006                                              *)
(* University of Strasbourg 2008                                           *)
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(* on_line *)

Lemma test_py_on_line_4_b : forall I B C,
B<>C -> on_line I B C -> Py B I C = Py B I C.