private String localGraph(int i){
        switch(i){
            case 0: 
                return " _";
            case 1: 
                return "| |      ";
            case 2: 
                return "| |      ";
            case 3:
                return "| |___   ";
            case 4:
                return "|_____|  ";       
        }
        return null;
    }