Maestro n° 086 : Page 87 - Gr 84
L4C4 -6- L4C3 =6= L5C3 -6-2- L5C3 =2= L5C5 -2-9- L5C5 =9= L7C5 -9-6- L7C5 =6= L7C4 -6- L4C4 donc L4C4 ≠ 6