TAREA 15

                                                                                     
                                                                                                      

                                 4  433
                      4         5  435                                                                                                           
                                 7  437

                                 4  533
   3                5          5  535
                                 7  537
                              
                                  4  737
                       7         5  735
                                   7  733
      
                                 4  444
                      4         5  445
                                 3  443
                                
                                 4  544
 4                    5        3  545
                                 3  543
                                 
                                 4  344
                     3          5  345
                                 3  343