Maestro n° 099 : Page 84 - Gr 81
L6C9 =4=6= L6C9 -6- L6C8 =6= L9C8 -6- L9C4 =6=9= L9C4 -9- L1C4 =9= L1C9 -9-7- L1C9 =7= L8C9 -7-4- L8C9 =4= L8C7 donc L56C7 et L8C9 ≠ 4