int[] data = {0,1,5,3,4,2,6};
        int length = data.length;
        int expected=(int)Math.pow(2, length)-1;
        int result=0;
        int val=0;
        for (int index=0; index<length; index++)
        {
            val = data[index];
            result |=(int)Math.pow(2,val);
        }
        if (result==expected)
        System.out.println("No duplicates");
        else
        System.out.println("Duplicates");