Copyright 2000, Mojam Media, Inc., all rights reserved. Author: Skip Montanaro

Copyright 1999, Bioreason, Inc., all rights reserved. Author: Andrew Dalke

Copyright 1995-1997, Automatrix, Inc., all rights reserved. Author: Skip Montanaro

Copyright 1991-1995, Stichting Mathematisch Centrum, all rights reserved.

Permission to use, copy, modify, and distribute this Python software and its associated documentation for any purpose without fee is hereby granted, provided that the above copyright notice appears in all copies, and that both that copyright notice and this permission notice appear in supporting documentation, and that the name of neither Automatrix, Bioreason or Mojam Media be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission.