Maestro n° 104 : Page 59 - Gr 56
L1C5 =7=9= L1C5 -9- L2C5 =9= L2C9 -9-6- L2C9 =6= L1C9 -6-4- L1C9 =4= L1C6 -4- L8C6 =4=7= L8C6 donc L1C6 et L89C5 ≠ 7