no existe

l                                              
l                                              
l  aa                                          
l a a                                          
l aaa                                          
                                               
                                               
                                               
                       ii               ii     
 ccc ooo nnn   ss  ccc    eee nnn   ccc     aa 
c    o o n  n  s  c    ii e e n  n c    ii a a 
 ccc ooo n  n ss   ccc ii ee  n  n  ccc ii aaa 
                                               
                                               
                             t                 
                     ii      t                 
nnn  ooo     eee x x     ss ttt eee            
n  n o o     e e  x  ii  s   t  e e            
n  n ooo     ee  x x ii ss   tt ee