Maestro n° 101 : Page 87 - Gr 84
L2C4 -2- L2C7 =2=5= L2C7 -5- L2C5 =5= L1C5 -5-1- L1C5 =1= L3C4 -1-3- L3C4 =3= L2C4 donc L2C4 ≠ 2