Maestro n° 099 : Page 59 - Gr 56
L5C9 =5= L5C5 -5-8- L5C5 =8= L4C5 -8- L4C7 =8= L6C7 -8-7- L6C7 =7= L6C9 -7-5- L6C9 =5= L6C6 donc L5C5 et L6C9 ≠ 5