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Class Relationship

1. Aggregation - "part of" relationship
    - Composition is form of aggregation.
    - Composition relationship is static. A is composed of B. B can not exist on its own. [Engine in a car]
    - Aggregation relationship is dynamic. A aggregates B. A and B can exist on their own. [Airplanes at an airport]
 
2. Generalization / Specialization - "is-a"
    - Inheritance
 
3. Association
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