matrix := [ [0,3,0,0,0,0,0,0], [3,4,2,0,0,0,0,0], [1,0,1,0,0,0,0,0], [0,4,2,3,0,0,0,0], [1,4,0,0,3,0,0,0], [0,2,1,0,0,3,0,0], [2,1,4,0,0,0,3,0], [3,3,3,0,0,0,0,3] ]*Z(5);