完善、透明的交易规则是会计市场正常运转的基础，这在WTO专业服务工作小组（WPPS）为会计服务专门制定的（有关会计服务业国内规章方面的守则）中有明确的规定。
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They have three - they DynCorp and Triple Canopy that are also allowed to provide this what they called WPPS - Worldwide Protection Services.
NPR: Oversight of Blackwater a 'Grey Zone,' Author Says
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