Modifications

a4--a5--a6--a7--a8--a9;d2--b3--b4--b5;e2--c3--c4--c5;a1--a2d2--a3d3--d4--d5--d6;a1--e2--e3--e4--e5--e6;d6--a7;e6--a7;b5--a6;c5--a6;b4--a5;c4--a5;b3--a4;c3--a5a4;d3--a6b4;e3--a7c4;d4--a8b5;e4--a9c5;a1[shape=box label="Noeud a1" href="[[#Noeud a1]]" pos="0,9!"]a4[shape=box label="Noeud a4" href="[[#Noeud a4]]" pos="0,6!"]a5[shape=box label="Noeud a5" href="[[#Noeud a5]]" pos="0,5!"]a6[shape=box label="Noeud a6" href="[[#Noeud a6]]" pos="0,4!"]a7[shape=box label="Noeud a7" href="[[#Noeud a7]]" pos="0,3!"]a8[shape=box label="Noeud a8" href="[[#Noeud a8]]" pos="0,2!"]a9[shape=box label="Noeud a9" href="[[#Noeud a9]]" pos="0,1!"]b3[shape=box label="Noeud b3" href="[[#Noeud b3]]" pos="1,7!"]b4[shape=box label="Noeud b4" href="[[#Noeud b4]]" pos="1,6!"]a2b5[shape=box label="Noeud 2b5" href="[[#Noeud 2b5]]" pos="1,5!"]a3c3[shape=box label="Noeud 3c3" href="[[#Noeud 3c3]]" pos="-1,7!"]a4c4[shape=box label="Noeud 3c4" href="[[#Noeud 4c4]]" pos="-1,6!"]a5c5[shape=box label="Noeud 3c5" href="[[#Noeud c5]]" pos="-1,5!"]d2[shape=box label="Noeud d2" href="[[#Noeud d2]]" pos="2,8!"]d3[shape=box label="Noeud d3" href="[[#Noeud d3]]" pos="2,7!"]a6d4[shape=box label="Noeud 3d4" href="[[#Noeud d4]]" pos="2,6!"]d5[shape=box label="Noeud d5" href="[[#Noeud d5]]" pos="2,5!"]d6[shape=box label="Noeud d6" href="[[#Noeud d5]]" pos="2,4!"]e2[shape=box label="Noeud e2" href="[[#Noeud e2]]" pos="-2,8!"]a7e3[shape=box label="Noeud 3e3" href="[[#Noeud e3]]" pos="-2,7!"]e4[shape=box label="Noeud e4" href="[[#Noeud e4]]" pos="-2,6!"]a8e5[shape=box label="Noeud 3e5" href="[[#Noeud 8e5]]" pos="-2,5!"]a9e6[shape=box label="Noeud 3e6" href="[[#Noeud 9e6]]" pos="-2,4!"]

=Noeud Niveau 1===Noeud a1===Niveau 2===Noeud d2====Noeud e2===Niveau 3===Noeud b3====Noeud c3====Noeud d3====Noeud e3===Etc...=