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Duplicate detection

We are trying to develop duplicate detection software. It should identify if a string appears as part of the previous strings. You would like to write a program that would print Duplicate if the inputted string is part of its predecessors and Unique otherwise.
The input contains 4 strings. For each of those, the program should print Duplicate if it has already appeared in any of the previous strings and Unique otherwise.
Input
Output
Hi, I would like to invite you to a conference My name is Bob a conference Bob is super smart!
Unique Unique Duplicate Unique
 
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