grandmaitre n° 17 : Page 62 - Grille 49
L3C8 =7= L3C3 -7-8- L3C3 =8= L1C3 -8-3- L1C3 =3= L1C7 -3-6- L1C7 =6= L2C7 -6-7- L2C7 =7= L7C7 donc L2C7 et L7C8 ≠ 7