matrix := [
[5,0,0,0,0,0,0],
[0,2,0,0,0,0,0],
[0,0,0,5,0,0,0],
[0,0,5,0,0,0,0],
[0,0,0,0,2,0,0],
[0,0,0,0,0,0,5],
[0,0,0,0,0,5,0]
]*Z(7);