There are two UML diagrams types for describing dynamic models: StateChart diagrams and Interaction diagrams. Let's focus on interaction diagrams. Interactions diagrams can be categorized into two types: Communication diagram and sequence diagram. Let's reduce our focus on the sequence diagram. The structure of the sequence diagram helps us to determine how decentralized the system is. We distinguish two structures for sequence diagrams. What are those two structures (or diagrams)? And when do we choose each structure?

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