Maestro n° 104 : Page 28 - Gr 25
L3C2 =8= L7C2 -8-4- L7C2 =4= L7C1 -4-6- L7C1 =6= L7C9 -6- L8C7 =6=9= L8C7 -9- L8C3 =9=8= L8C3 donc L13C3 et L7C2 ≠ 8