Maestro n° 101 : Page 76 - Gr 73
L1C3 =2= L8C3 -2- L7C1 =2= L7C9 -2- L5C9 =2=6= L5C9 -6- L2C9 =6= L2C7 -6-3- L2C7 =3= L1C7 donc L1C7 ≠ 2 et L1C3 ≠ 3