Maestro n° 099 : Page 31 - Gr 28
L1C1 =8= L7C1 -8-4- L7C1 =4= L7C2 -4- L4C2 =4=8= L4C2 -8- L1C2 =8=7= L1C2 donc L1C1 ≠ 7 et L1C2 ≠ 8