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Related Clues:
- The Sphinx had a famous one
- Puzzle or fashion model
- Difficult question
- Confusing query
- "Hmm" provoker
- Sphinx's poser
- It's no no-brainer
- See 19 Down
- Vexing question
- Appropriately named monthly of the National Puzzlers' League, with 'The'
- Perplexing problem
- WWII encryption machine
- Closed book
- Wannabe
- Something of a mystery