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                                                                    EXHIBIT 23.1

                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


    As independent public accountants, we hereby consent to the incorporation of
our reports included in this Form 10-K into the Company's previously filed
Registration Statements (Form S-8, No. 33-75570 and Form S-3, No. 333-2258 and
No. 333-21913).


                                               ARTHUR ANDERSEN LLP

    Portland, Oregon
    September 23, 1997