Maestro n° 099 : Page 41 - Gr 38
L1C4 =2=1= L1C4 -1- L6C4 =1=5= L6C4 -5- L5C5 =5=2= L5C5 -2- L5C6 =2= L7C6 -2- L7C2 =2= L3C2 donc L1C3 et L3C4 ≠ 2