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1. 
abstract class Name { 
   private String name; 
   public abstract boolean isStupidName(String name) {} 
} 
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2. 
public class Something { 
   void doSomething () { 
       private String s = ""; 
       int l = s.length(); 
   } 
} 
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3. 
abstract class Something { 
   private abstract String doSomething (); 
} 
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4. 
public class Something { 
   public int addOne(final int x) { 
       return ++x; 
   } 
} 
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5. 
public class Something { 
   public static void main(String[] args) { 
       Other o = new Other(); 
       new Something().addOne(o); 
   } 
   public void addOne(final Other o) { 
       o.i++; 
   } 
} 
class Other { 
   public int i; 
} 
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class Something { 
    int i; 
    public void doSomething() { 
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