Virtuose n° 106 : Page 76 - Gr 73
L7C7 -9- L7C8 =9= L3C8 -9- L1C9 =9= L1C5 -9-5- L1C5 =5= L3C5 -5- L3C7 =5= L7C7 donc L7C7 ≠ 9