import java.util.ArrayList;

public class Search {
    static class Beholder {

        ArrayList<Beholder> naboer = new ArrayList<>();
        
        String data;

        Beholder(String d){
            data = d;
        }

    }



    static void printAlle(Beholder b){
        System.out.println(b.data);

        for (Beholder bb : b.naboer) {
            printAlle(bb);
        }
        

    }

    public static void main(String[] args) {
        
        
        
        Beholder hode = new Beholder("hode");
        Beholder v = new Beholder("1");
        v.naboer.add(new Beholder("1-1"));
        v.naboer.add(new Beholder("1-2"));
        Beholder h = new Beholder("2");
        h.naboer.add(new Beholder("2-1"));
        h.naboer.add(new Beholder("2-2"));
        hode.naboer.add(v);
        hode.naboer.add(h);



        printAlle(hode);
    }




}