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These are the names of the "release groups" that encoded the file.

This is a crucial tag. It means the original version released by the group had a technical flaw (like out-of-sync audio or a glitch in the video) and this new version has been fixed. What is Zombillénium ? zombillenium2019720pbdripx264ac3evotgx repack

This means the source of the video was a high-quality Blu-ray disc. These are the names of the "release groups"