I've added the implementation Carey (will refactor later) if I want to print also the phone number which it conflict with how can I do that?
Example I've in my list the values: 33, 34, 35, 36, 37, 34, 34, 29, 40
Now it will add the 2 times number 34 that they are not unique and it adds the first 34 to the unique list. If I want also to show that the first 34 conflicts with the 2nd and 3rd 34. How can I achieve that?