Check duplicate values and the count in an arraylist and store it in another list

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Check duplicate values and the count in an arraylist and store it in another list

Hi All,

I have a list which has four fields: year name, month name, file info and count of search string.

I need to count month name and the total of search string in that month and put that values in a new list. Please help to solve this logic.

Many Thanks

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