Maestro n° 087 : Page 72 - Gr 69
L1C2 -7- L2C2 =7= L2C5 -7- L8C5 =7= L8C9 -7-6- L8C9 =6= L8C1 -6- L3C1 =6= L1C2 donc L1C2 ≠ 7