/*
 * @(#)$Id: cnc_pr,v 1.1 1994/09/16 09:35:20 dream Exp $
 *
 * $Log: cnc_pr,v $
 * Revision 1.1  1994/09/16 09:35:20  dream
 * Initial revision
 *
 */

problem([]==>u1:pnat=>u2:pnat=>v:pnat=>u1=u2 in pnat=>plus(v,u1)=plus(v,u2)in pnat,_,_,_).
