Hi,
I have the following data:

0   12
1   10
1   4
1   6
1   7
1   13
2   21
2   23
2   20
3   18
3   17
3   16
3   27
3   33
4   11
4   8
4   19
4   16
4   9


In this data file I would like to sum the numbers of second column which
belong to the same number in the first column.
So the output would be:

0     12
1     40
2     64
        3     111
        etc.

Thank you.

Kind regards,
T. Bal

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