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<PAGE>
Consent of Independent Public Accountants
As independent public accountants, we hereby consent to the incorporation of our
reports in this Form 10-K, into the Company's previously filed Registration
Statement File Nos. 35-27317, 33-21698, 33-06183, 333-49779, and 333-62037.
ARTHUR ANDERSEN LLP
Vienna, VA
September 15, 2000
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