Can several non-permanent child entities be merged simultaneously?

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Yes, it is possible to merge several non-permanent child entities simultaneously. However, the process of merging multiple entities at once can be more complex and may require careful coordination of the data and relationships involved. It is important to ensure that all relevant data and relationships are considered and properly merged, and to handle any conflicts or duplicates that may arise during the process. It may be helpful to consult with a data management or database expert for guidance on how to effectively merge multiple entities.