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Is it possible to mention 2 names in one comment? For example, I want to write same answer for two people. I tried to do through "," and ";" but it did not work.
No - this is by design.
If you have a reply to something a commenter has asked, respond to them. For another commenter, reply to them separately.
Remember, though, comments are supposed to be brief and temporary, and used to gain clarification of a point - plan for having them deleted.