given a random string that contains a ruby-esque array, make sure that there are no duplicate elements
Start file
[11, 2, 3,5 , 1,1, 22, 4]
End file
[1, 2, 3, 4, 5, 11, 22]
1c1
< [11, 2, 3,5 , 1,1, 22, 4]
---
> [1, 2, 3, 4, 5, 11, 22]
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