Maestro n° 104 : Page 83 - Gr 80
L4C8 =5=7= L4C8 -7- L4C2 =7=4= L4C2 -4- L5C3 =4=6= L5C3 -6- L5C9 =6=2= L5C9 -2- L7C9 =2=5= L7C9 -5- L7C5 =5= L46C5 donc L4C4 ≠ 5