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i have the following data
123 01/01/2021
123 01/01/2021
123 01/01/2021
123 02/01/2021
123 02/01/2021
123 03/01/2021
123 03/01/2021
123 04/01/2021
i would like following result
123 4
where 4 is the number of days count regardless of how many per day.
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