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1. Arbre 1

   

   Avec le paquetage pst-tree.

   \pstree{\Tcircle{A}}
          {\pstree{\Tcircle{B}}
                  {\Tcircle{D}
                   \Tcircle{E}}
           \pstree{\Tcircle{C}}
                  {\Tcircle{F}
                   \Tcircle{G}}}