American society is growing increasingly litigeous; we regret the
necessity of the following notice.  That is, the copyright notice
below and the paragraph which follows must be included in the NULEX
distribution:
 
Copyright (c) 1986-1993 Clifton McFate, Kenneth D. Forbus
and Northwestern University.  All Rights Reserved.
 
Use, reproduction, and preparation of derivative works are permitted.
Any copy of this software or of any derivative work must include the
above copyright notice and this paragraph.  Any distribution of this
software or derivative works must comply with all applicable United
States export control laws.  This software is made available as is, and
Clifton McFate, Kenneth D. Forbus and Northwestern University disclaim all
warranties, express or implied, including without limitation the implied
warranties of merchantability and fitness for a particular purpose, and
notwithstanding any other provision contained herein, any liability for
damages resulting from the software or its use is expressly disclaimed,
whether arising in contract, tort (including negligence) or strict
liability, even if Clifton McFate, Kenneth D. Forbus
or Northwestern University is advised of the possibility of such damages.