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The use of the word enigma is apparently an enigma to you! Delicious irony!
The Enigma goes by Slug.
Enigma is a complex riddle or puzzle.
"An enigma wrapped in mystery and riddled with controversy" is how UFO's have been described.
He/she is an enigma.
The location of 'The Lost Dutchman' gold mine remains an enigma.
El código Enigma in Spanish is "the Enigma code" in English.