Maestro n° 104 : Page 75 - Gr 72
L1C9 =2= L1C8 -2-6- L1C8 =6= L1C4 -6- L5C4 =6=4= L5C4 -4- L5C8 =4=2= L5C8 donc L1C8 et L6C9 ≠ 2