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                                                                    EXHIBIT 23.1

                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

         As independent public accountants, we hereby consent to the use of
our reports and to all references to our Firm included in or made a part of
this registration statement.

                                            /s/ ARTHUR ANDERSEN LLP
                                            ARTHUR ANDERSEN LLP

Vienna, Virginia
September 20, 2000



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