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Thanks for your help, yes the file has only one column,,
I have try the code , but looks like there is a syntax error.. Please advise

---------- Post updated at 03:26 AM ---------- Previous...

Hi,

How to enumerate duplicate values, without sorting the file.

example

1 1
2 1
3 1
1 2
2 2
3 2
1 3
2 3
3 3

Where the first column have the repetead values...