public  Lab getUndoneLab(List<Lab> allLabs)
    {
        if(labs.size() == 0)
        {
            return allLabs.get(Randomizer.getRandom().nextInt(allLabs.size()));
        }
        for(Lab lab : allLabs)
        {
            for(int i=0;i<labs.size();i++)
            {
            if(!labs.get(i).getTitle().equals(lab.getTitle()))
            {
                return lab;
            }
            }
        }
        return null;        
    }