Maestro n° 086 : Page 58 - Gr 55
L7C2 =7=3= L7C2 -3- L7C5 =3= L8C6 -3-4- L8C6 =4= L2C6 -4-1- L2C6 =1= L2C4 -1-7- L2C4 =7= L8C4 donc L7C5 et L8C1 ≠ 7