How to keep only every nth line of a file

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Music by Eric Matyas
https://www.soundimage.org
Track title: Puzzle Game Looping

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Chapters
00:00 Question
00:57 Accepted answer (Score 145)
01:29 Answer 2 (Score 65)
02:15 Answer 3 (Score 25)
03:25 Answer 4 (Score 7)
04:02 Thank you

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Full question
https://superuser.com/questions/396536/h...

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Tags
#bash

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