grandmaitre n° 17 : Page 14 - Grille 5
L1C3 -6- L3C1 =6= L3C8 -6-8- L3C8 =8= L3C9 -8-5- L3C9 =5= L2C9 -5- L2C3 =5= L1C3 donc L1C3 ≠ 6