%% noeuds rectangulaires

autocrop
-2 5 Tr rootnode 
[
   Tr
   Tr
   Tr [Tr Tr Tr]
   Tr
] 
tree

2 5 Tr rootnode 
[
   Tr
   Tr
   Tr
   [
      Tr 
      Tr 
      Tr [Tr Tr]
   ]
   Tr
] 
tree