Maestro n° 104 : Page 82 - Gr 79
L9C1 -9- L9C6 =9= L1C6 -9-6- L1C6 =6= L8C6 -6- L8C4 =6=4= L8C4 -4- L9C5 =4= L9C1 donc L9C1 ≠ 9