Maestro n° 102 : Page 24 - Gr 21
L3C8 =3= L5C8 -3- L5C2 =3= L7C2 -3-9- L7C2 =9= L7C5 -9- L6C5 =9=6= L6C5 -6- L6C6 =6=2= L6C6 -2- L6C9 =2=3= L6C9 -3- L3C9 =3=7= L3C9 donc L3C9 ≠ 3 et L3C8 ≠ 7