Maestro n° 099 : Page 66 - Gr 63
L2C7 =5=6= L2C7 -6- L2C2 =6= L7C2 -6-1- L7C2 =1= L8C2 -1- L8C8 =1=5= L8C8 donc L3C8 et L89C7 ≠ 5