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Let X be the set consisting of the fi...

Let `X` be the set consisting of the first 2018 terms of the arithmetic progression `1,\ 6,\ 11 ,\ ddot,` and `Y` be the set consisting of the first 2018 terms of the arithmetic progression `9,\ 16 ,\ 23 ,\ ddot` . Then, the number of elements in the set `XuuY` is _____.

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