Maestro n° 087 : Page 72 - Gr 69
L1C2 -2- L2C1 =2=8= L2C1 -8- L7C1 =8= L7C2 -8-9- L7C2 =9= L9C2 -9-6- L9C2 =6= L1C2 donc L1C2 ≠ 2