19
                                                    18
                                           15
                                     13
                                     13
                               11
                               11
                           9
                           9
                        8
                     7
                     7
                  6
                  6
                  6
                  6
               5
            4
            4
         3
         3
         3
      2
      2
      2
      2
      2
      2
      2
   1
   1
   1
   1
   1
   1
   1
   1
   1
   1
   1
   1
   1