TABLE OF CONTENTS
    3. chapter 3. 
    4. chapter 4. 
        4.1 chapter 4.1 
        4.2 chapter 4.2 
    5. chapter 5. 
        5.1 chapter 5.1 
    6. chapter 6. 
        6.1 chapter 6.1 
        6.2 chapter 6.2 
        6.3 chapter 6.3 
    7. chapter 7. 
        7.1 chapter 7.1 
        7.2 chapter 7.2 
        7.3 chapter 7.3 
        7.4 chapter 7.4 
            7.4.1 chapter 7.4.1 
        7.5 chapter 7.5 
            7.5.1 chapter 7.5.1 
        7.6 chapter 7.6 
    8. chapter 8. 


The first line must not contain a chapter label.
    3. chapter
    
    4. chapter
    
        4.1 chapter
        
        4.2 chapter
        
    5. chapter
    
        5.1 chapter
        
    6. chapter
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        6.1 chapter
        
        6.2 chapter
        
        
        6.3 chapter
        
    7. chapter
    
        7.1 chapter
        
        7.2 chapter
        
        7.3 chapter
        
        7.4 chapter
        
            7.4.1 chapter
            
        7.5 chapter
        
            7.5.1 chapter
            
        7.6 chapter
        
    8. chapter