Maestro n° 101 : Page 63 - Gr 60
L4C5 =9=7= L4C5 -7- L4C1 =7=4= L4C1 -4- L4C8 =4= L6C7 -4-1- L6C7 =1= L6C1 -1-3- L6C1 =3= L5C1 -3-7- L5C1 =7= L5C5 donc L4C5 ≠ 7 et L5C5 ≠ 9