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For this week's challenge, we have provided a list of transactions including the [Client_Number], [Date], & [Finance Amount]. Since not every customer makes a purchase everyday, they only appear on dates that they have made a purchase. We would like to include current customers in the dataset with a "finance amount" of 0 for the missing dates after their first purchase. They should not have entries for dates prior to their first purchase. Assume first purchase dates are the earliest entry in the dataset.