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Related Clues:
- River block
- A river runs to it
- China's Three Gorges, for one
- What paper towels do to a toilet
- It checks the water
- Structure whose name might make kids giggle (3)
- Keep from flowing
- Pipe blocker
- Hydroelectric power site
- Pedigree listing
- Drain pain
- Mother among mammals
- Get blocked up
- Barrier
- Mica, for one