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            
    
   Â    
 
   Â     
             
  
    
   Â    
    
   Â     
         
 
          
       
    
   ø     0     
 + -         

     
   ø          

    
   ø    0     
        
            
          

   H          
          
  
          h    
       
          
         
             
 
Elemento doble
Elemento triple
Elemento puente
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