Maestro n° 104 : Page 16 - Gr 13
L5C7 =7= L5C3 -7-2- L5C3 =2= L4C3 -2- L4C8 =2= L6C8 -2-7- L6C8 =7= L8C8 -7- L9C7 =7=6= L9C7 donc L5C7 ≠ 6 et L9C7 ≠ 7