Maestro n° 094 : Page 62 - Gr 59
L4C2 =6= L9C2 -6-7- L9C2 =7= L9C3 -7-5- L9C3 =5= L6C3 -5-9- L6C3 =9= L6C8 -9-4- L6C8 =4= L6C1 donc L4C2 ≠ 4 et L6C1 ≠ 6