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In a resonating pipe that is open at one end and closed at the other end, there
Tornado Siren
An audible siren or alarm system used to warn people in a specific area about the imminent threat of a tornado.
Benefit
An advantage or profit gained from something.
Excludable
A characteristic of a good or service that allows its owner to prevent others from using it without paying for it.
Free Rider
A person who receives the benefit of a good but avoids paying for it
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