matrix := [
[1,2,0,0,0,0,0,0],
[0,0,5,0,0,0,0,0],
[4,4,6,0,0,0,0,0],
[0,0,0,0,5,0,0,0],
[0,0,0,0,0,0,5,0],
[0,0,0,0,0,0,0,5],
[0,0,0,5,0,0,0,0],
[5,6,5,5,5,2,5,2]
]*Z(7);