/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.ArrayList;
 
/* Name of the class has to be "Main" only if the class is public. */
public class Main {
 
    /**
     * @param args the command line arguments
     */
    static ArrayList list;
 
    public static void main(String[] args) {
        // TODO code application logic here
        Main nm = new Main();
        nm.list = new ArrayList();
        /*
        for(int i=1; i<= 4; i++) {
            list.add(i);
        }
        
        list.remove(list.indexOf(1));
        
        for(int i=0; i<= 2; i++) {
            System.out.print(list.get(i));
        }
        */
        nm.test1();        
    }
 
    public void test1() {        
        for(int i=1; i<= 4; i++) {
            if(!list.contains(i)) {
                list.add(i);
                test1();
                list.remove(list.indexOf(i));
            }
        }           
        if(list.size() == 4) 
        {
            for(int i=0; i< 4; i++) {
                System.out.print(list.get(i));
            }
            System.out.println("");
        }
    }
}

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