Maestro n° 104 : Page 69 - Gr 66
L5C8 =1= L2C8 -1- L2C5 =1=3= L2C5 -3- L8C5 =3=8= L8C5 -8- L8C7 =8= L7C9 -8-6- L7C9 =6= L5C9 donc L5C9 ≠ 1 et L5C8 ≠ 6