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Related Clues:
- Advanced math assignment
- Theorem work
- Challenging question
- Port initially on the house at Confirmation
- Geometry class challenge
- *Smoking gun, e.g
- One requiring solution
- Shortly, exploratory spacecraft meets another in difficulty
- Academic circle held demonstration
- One hard to understand, solve
- Alcohol strength
- Academic protecting old mathematical work
- Difficulty finds British and the French involved in concert
- A matter hard to solve
- Academic concealing old evidence