matrix := [
[0,5,0,0,0,0,0],
[0,0,5,0,0,0,0],
[5,0,0,0,0,0,0],
[0,0,0,0,5,0,0],
[0,0,0,0,0,5,0],
[0,0,0,5,0,0,0],
[0,0,0,0,0,0,5]
]*Z(7);