Maestro n° 102 : Page 81 - Gr 78
L7C3 -6- L9C13 =6= L9C7 -6- L78C8 =6= L2C8 -6-9- L2C8 =9= L3C8 -9- L3C3 =9= L5C3 -9-3- L5C3 =3= L7C3 donc L7C3 ≠ 6