Maestro n° 087 : Page 79 - Gr 76
L1C8 -4- L7C8 =4= L7C9 -4-2- L7C9 =2= L3C9 -2- L3C5 =2=5= L3C5 -5- L1C5 =5= L1C8 donc L1C8 ≠ 4