public void set_human_input(int index)
    {
    	// we have agents, command is up, down, left or right
        if(agents.size() > 0 && index < 14)
        {
        	agents.get(0).set_human_input(index);
        } else // command is split or merge
        {
        	for(Agent a : agents)
        	{
        		a.set_human_input(index);
        	}
        }
        	
    }