Maestro n° 100 : Page 66 - Gr 63
L9C8 =4= L9C4 -4- L4C4 =4= L5C5 -4- L5C2 =4= L1C2 -4-7- L1C2 =7= L7C2 -7-2- L7C2 =2= L7C7 donc L9C8 ≠ 2 et L7C7 ≠ 4