Maestro n° 103 : Page 81 - Gr 78
L2C5 =7= L5C5 -7-2- L5C5 =2= L4C6 -2-6- L4C6 =6= L4C2 -6-8- L4C2 =8= L4C8 -8-7- L4C8 =7= L4C4 donc L23C4 et L5C5 ≠ 7