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The numbers 1,2,3,…,201,2,3, \ldots , 201,2,3,…,20 are written on a blackboard.
We define an operation ZZZ as: Erasing two numbers aaa and bbb and writing new number a+b−1a+b-1a+b−1 on a blackboard.
What number can be there on the blackboard after 191919 operations?
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