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What is aggregation?
It 'a different kind of relationship which indicates whether an object is part of another.
It is indicated by a line whose end is connected to a diamond, depending on whether it is full or empty, it indicates that the aggregate is loose or tight.
An aggregate is loose is the fact that the contained object has its own life without the container object.
Instead close the aggregation indicates that the object has a life of its own content without the presence of the container.
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