This song is called atlast by The Obsessions
The order of the song goes
Intro
Verse
Chorus
Post chorus
Verse
Chourus

Intro
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Verse
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|-------------7----577577777777777777665543-----------
|-00000000--000---------------------------------------------

Chorus
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|--------------------7777777777777333222000------------------------
|-0000000000000--------------------------------3202------------------

Post Chorus
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|-0000000000001212121212121211-1110109998887777-----------