
                              ARTHUR ANDERSEN LLP

                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS




As independent public accountants, we hereby consent to the incorporation of our
report  included  in  this  Form  10-K,  into  the  Company's  previously  filed
registration  Statement  File  Nos.  33-79942,  33-66980,  33-86230,  333-03865,
333-01874 and 333-22943.


                                             /s/ Arthur Andersen LLP


Phoenix, Arizona,
     November 18, 1997.
