/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
       int n;
        n=3;
        mystery (n);
 	}
 
 
    public static void mystery(int n)
    {
    	int k;
    	for (k=0;k<n;k++)
    	{
 
        	mystery (k);
        	System.out.print(k);
    	}
    }
 
}

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