/* 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
	{
		String a = "String 1";
		String b = "String 2";
		String c = null;
 
		System.out.println(a);
		System.out.println(b);
		System.out.println(c);
 
		c = b;
 
		System.out.println(a);
		System.out.println(b);
		System.out.println(c);
 
		b = "String 3";
 
		System.out.println(a);
		System.out.println(b);
		System.out.println(c);
	}
}

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