Maestro n° 085 : Page 24 - Gr 21
L7C2 =9= L5C2 -9- L5C4 =9= L3C4 -9-4- L3C4 =4= L3C3 -4-2- L3C3 =2= L2C3 -2-5- L2C3 =5= L2C2 -5-6- L2C2 =6= L2C7 -6-7- L2C7 =7= L7C7 donc L7C2 ≠ 7 et L7C7 ≠ 9