1) root 81 17 absent (0.79012346 0.20987654)  
   2) Start>=8.5 62  6 absent (0.90322581 0.09677419)  
     4) Age=old,young 48  2 absent (0.95833333 0.04166667)  
       8) Start>=13.5 25  0 absent (1.00000000 0.00000000) *
       9) Start< 13.5 23  2 absent (0.91304348 0.08695652) *
     5) Age=middle 14  4 absent (0.71428571 0.28571429)  
      10) Start>=12.5 10  1 absent (0.90000000 0.10000000) *
      11) Start< 12.5 4  1 present (0.25000000 0.75000000) *
   3) Start< 8.5 19  8 present (0.42105263 0.57894737)  
     6) Start< 4 10  4 absent (0.60000000 0.40000000)  
      12) Number< 2.5 1  0 absent (1.00000000 0.00000000) *
      13) Number>=2.5 9  4 absent (0.55555556 0.44444444) *
     7) Start>=4 9  2 present (0.22222222 0.77777778)  
      14) Number< 3.5 2  0 absent (1.00000000 0.00000000) *
      15) Number>=3.5 7  0 present (0.00000000 1.00000000) *