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Components in the sequence diagrams

Write down the different components in the sequence diagrams?

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The different components in the sequence diagrams are as follows:

a) Actor: Actor symbolizes an external user or end user who interacts with the system.

b) Object: Object is symbolized by one of components of system.

c) Unit: The unit is a subsystem or a sub component or other entity in the system.

d) Separator: Separator symbolizes a boundary among sub systems, components and units.

e) Group: It symbolizes various header elements in the sub-system.

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