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Related Clues:
- Quandary or dilemma
- Question or source of perplexity
- Conclusive evidence or verification
- Something that needs solving
- Difficulty, puzzle
- Difficulty, poser
- Evidence that establishes truth
- Incontrovertible evidence
- Demonstration of the truth of something
- Evidence that establishes the truth
- For the hard stuff it's soft on the house
- Puzzler
- Homework problem in geometry
- See 10
- Demonstration of spiritual strength