Maestro n° 087 : Page 82 - Gr 79
L5C2 =9=7= L5C2 -7- L8C2 =7= L8C9 -7- L9C7 =7=9= L9C7 -9- L7C79 =9= L7C4 -9- L23C4 =9= L1C56 donc L1C2 ≠ 9