Each column in the sequence diagram identifies an instance of an actor or a class. Each "row" is the message sent or received by the entities in the column.

Name: Each column in the sequence diagram identifies an instance of an actor or a class. Each "row" is the message sent or received by the entities in the column.
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In a sequence diagram, columns represent different objects or actors, and rows represent the sequence of messages exchanged between them.

Each Column in the Sequence Diagram Identifies an Instance of an Actor