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 public Vector<T> sort(Vector<T> list, Comparator<T> comp, Mode mode) {
        if(___________________________)
            return null;
        for(int a = 0;b>a ;b++ ) {
            for(int b = 0;a>b ;a++ ) {
                if(compare( a,b , comp, mode)) {
                    _______________;
                }
            }
        }
    }

}