Maestro n° 101 : Page 73 - Gr 70
L1C9 =4= L1C3 -4-6- L1C3 =6= L2C3 -6- L2C7 =6=8= L2C7 -8- L2C2 =8=4= L2C2 donc L1C3 et L2C9 ≠ 4