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package cn.edu.uibe;  
public class HelloWorld {  
    public static void main(String[] args) {  
        System.out.println("Hello World!");  
    }  

package cn.edu.uibe;
public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello World!");
    }
}
 
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public class Light {  
    private int brightness = 5;  
    public void brighten(Light another){  
        another.brightness++;  
    }  
    public static void main(String[] args) {  
    


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package cn.edu.uibe;
public class HelloWorld {
    public static void main(String[] args) {
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