/*
 * @(#)$Id: union,v 1.1 1994/09/16 09:37:56 dream Exp $
 *
 * $Log: union,v $
 * Revision 1.1  1994/09/16 09:37:56  dream
 * Initial revision
 *
 */

union(l1,l2)<==>term_of(union)of l1 of l2.
