Maestro n° 094 : Page 85 - Gr 82
L4C5 =1=8= L4C5 -8- L5C4 =8= L5C7 -8-5- L5C7 =5= L4C9 -5-1- L4C9 =1= L6C9 donc L4C9 et L6C5 ≠ 1