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Activity diagrams say what happens, not who does what.
This means that the diagram does not specify which class is responsible for individual actions inside activity.
To contemplate the problem, activity diagrams can be partitioned into swim lanes, or even a grid-like dimensions, and further, nested grids with hierarchical rows and/or columns.
Note: activity diagrams aren't the most widely used UML technique at the moment; therefore, it is best to use more of swim lane partitions, and less of the grids.
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