SearchUniqueByList<T> - search unique from list of files.

No constructors.

Search<List<String>, List<String>> search = new SearchUniqueByList<>();

List<String> filesWithDuplicates = new ArrayList<String>() {{
    add("/music/opus/opus111.mp3");
    add("/music/opus/opus109.mp3");
    add("/music/opus/opus111.mp3");
}};

List<String> files = search.answer(list);
files.forEach(System.out::println);