matrix := [
[0*Z(25),0*Z(25),Z(25)^24,0*Z(25)],
[0*Z(25),0*Z(25),0*Z(25),Z(25)^24],
[Z(25)^9,Z(25)^9,0*Z(25),0*Z(25)],
[Z(25)^15,Z(25)^21,0*Z(25),0*Z(25)]
];