Maestro n° 103 : Page 38 - Gr 35
L3C6 =7= L3C1 -7- L2C3 =7=9= L2C3 -9- L9C3 =9=8= L9C3 -8- L8C3 =8=1= L8C3 -1- L8C6 =1= L7C6 -1-7- L7C6 =7= L7C4 donc L2C4 et L7C6 ≠ 7