ORBIT Copyright (c) 1994 Laboratoire MASI, Universite Paris 6, France Permission to use, copy, and modify this software and its documentation for educational, research, and non-profit purposes and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation, and that the name of the Universite Paris 6 not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. The Universite Paris 6 makes no representations about the suitability of this software for any purpose. It is provided "as is" without express or implied warranty.