Maestro n° 085 : Page 74 - Gr 71
L1C1 =9= L2C1 -9-7- L2C1 =7= L2C6 -7-4- L2C6 =4= L7C6 -4- L9C5 =4=5= L9C5 -5- L9C8 =5= L3C8 -5-7- L3C8 =7= L1C8 donc L1C1 ≠ 7 et L1C8 ≠ 9