Maestro n° 087 : Page 56 - Gr 53
L2C6 =7= L2C8 -7-8- L2C8 =8= L2C2 -8-9- L2C2 =9= L1C2 -9- L1C7 =9=6= L1C7 -6- L3C9 =6= L3C4 -6-8- L3C4 =8= L6C4 -8-7- L6C4 =7= L6C6 donc L13C6 ≠ 7