Maestro n° 085 : Page 74 - Gr 71
L1C8 =7= L3C8 -7-5- L3C8 =5= L9C8 -5- L9C5 =5=4= L9C5 -4- L7C6 =4= L2C6 -4-7- L2C6 =7= L2C1 donc L1C23 ≠ 7