Maestro n° 086 : Page 69 - Gr 66
L5C3 =8= L4C3 -8-3- L4C3 =3= L4C5 -3- L6C5 =3=4= L6C5 -4- L6C8 =4= L5C9 donc L5C3 ≠ 4 et L5C9 ≠ 8