Maestro n° 099 : Page 75 - Gr 72
L1C9 -8- L1C1 =8= L9C1 -8-4- L9C1 =4= L9C3 -4-9- L9C3 =9= L1C3 -9-1- L1C3 =1= L1C9 donc L1C9 ≠ 8