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