How come one user can delete another user's 755 files?

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Track title: CC E Schuberts Piano Sonata D 784 in A

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Chapters
00:00 Question
01:12 Accepted answer (Score 64)
01:51 Answer 2 (Score 12)
02:43 Thank you

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Full question
https://superuser.com/questions/834948/h...

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Tags
#linux #security #filepermissions

#avk47