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Related Clues:
- Think tank matter
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- Inventor's brainchild
- Mental creation
- Thought hidden in eight long puzzle answers
- Inventor's first step
- Start of a plan
- A good one may come to mind
- Brain flash
- Creative flash
- Inventor's spark
- It starts with a germ
- Reason to shout ''Eureka!''
- ''The very'' item
- Prelude to an invention