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what do you think the chances are that the $10 and $20 notes went through the same machine to come up with the same stuck digits with the same remnants on the same series on the same district?
That certainly could be a possibility. When I see $1 notes with stuck digits, or missing digits, they are usually being sold by someone who has a stack of them and are sold either in groups (consecutive numbers) or one by one within the same week.