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enigma▼nounsomething puzzling, mysterious or inexplicable
mystery▼nounsomething secret or unexplainable
secret▼nounknowledge that is hidden
state secret▼nounrestricted information of national importance
open secret▼nounwidely known fact not mentioned
secret of Polichinelle▼nounsecret known to everyone
trade secret▼nounformula, practice, process, design
professional secrecy▼noun
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