• Confidential addressee
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• Confidential conversation
• Confidential correspondence
• Confidential discussion
• Confidential document
• Confidential dossier
• Confidential files
• Confidential helpline
• Confidential hotline
• Confidential informant
• Confidential information
• Confidential informer
• Confidential memo
• Confidential memorandum
• Confidential nature
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• Confidential report
• Confidential shredder
• Confidential snitch