can one object to belong to multiple composites(aggregates)Formally, UML does not prohibit it, so that you can.
The laughter can be seen that Like is part of the three objects- The relation part-whole is aggregation. Shows you the composition: a like instance of a class can exist ONLY within instances of these three classes. Comment destroyed - destroyed is like
Or should I replace the usual Association?Well, it is important to understand the business context of the subject area and use likes and what you want from this chart.
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