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Glad you've solved your problem.

Please mark this thread as solved

Why decide what technique to use before you have determined the steps the code needs to take to solve the problem? Can you list the steps you would use to solve the problem if you were to do it...

Let me rephrase that to see if I understand: You want to write a method that takes a String of numeric digits and checks that the digits are unique. It will return true if they are and false if not....