Maestro n° 101 : Page 86 - Gr 83
L5C6 -7- L5C7 =7= L3C7 -7-3- L3C7 =3= L3C6 -3- L1C4 =3= L1C1 -3-9- L1C1 =9= L1C8 -9- L5C8 =9= L5C6 donc L5C6 ≠ 7