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Which of the following addresses the rules concerning the relationships between entity types?
Aircraft
A vehicle designed for air travel that has wings and one or more engines.
Explosives
Substances that undergo rapid chemical changes, often with the production of gas, heat, and pressure, capable of causing an explosion.
Luggage
Personal belongings packed in suitcases or bags for traveling.
X-rays
Electromagnetic radiation of high energy and very short wavelength, which is able to pass through many materials opaque to light.
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