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                                                                    EXHIBIT 23.1


                    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 Form S-8
Registration Statement File No. 333-75351, Form S-8 Registration Statement File
No. 333-34999, and Form S-3 Registration Statement File No. 333-55837.




                                                             ARTHUR ANDERSEN LLP

Dallas, Texas,
June 28, 2000



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