Maestro n° 100 : Page 69 - Gr 66
L6C8 =6= L8C8 -6-1- L8C8 =1= L8C7 -1- L5C7 =1= L5C9 -1-6- L5C9 =6= L9C9 donc L5C9 et L8C8 ≠ 6