What are package diagram? What are collaboration diagram?

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Collaboration Diagrams:
An alternative presentation of a sequence diagram. We uses boxes to desibe objects, the lines connecting two boxes indiate that the objects collborate with to one another and we use a multiplicity factor "*" to indiate that all elements of the aggregation receive a message.
Package Diagram:
Complete set of sequence Diagrams or Collaboration Diagrams of the system.
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