Maestro n° 087 : Page 83 - Gr 80
L9C8 -1- L9C4 =1= L4C4 -1-5- L4C4 =5= L4C9 -5-6- L4C9 =6= L4C8 -6- L3C8 =6=1= L3C8 -1- L9C8 donc L9C8 ≠ 1