Maestro n° 102 : Page 27 - Gr 24
L1C8 =2= L1C9 -2-3- L1C9 =3= L9C9 -3-7- L9C9 =7= L9C6 -7- L4C6 =7= L4C4 -7-2- L4C4 =2= L4C9 donc L1C9 et L5C8 ≠ 2