Maestro n° 104 : Page 55 - Gr 52
L1C3 =7= L3C3 -7-4- L3C3 =4= L3C1 -4- L9C1 =4= L9C9 -4- L5C9 =4=2= L5C9 -2- L6C7 =2= L1C7 donc L1C3 ≠ 2 et L1C7 ≠ 7