What are the various components in sequence diagrams, Computer Engineering

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? Actor: Actor shows an external user / end user who interact with the system.

? Object: Object is shown by one of components of the system.

? Unit: A unit is a subsystem, or a sub component or other entity in the system.

? Separator: Separator shows a boundary among sub systems, components or units.

? Group: Represents dissimilar header elements in the subsystem.

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