matrix := [
[0,0,0,0,0,0,6,0,7,0,0],
[7,0,0,0,0,0,6,0,0,0,0],
[0,0,0,0,0,7,6,0,0,0,0],
[0,0,0,0,0,0,6,0,0,0,0],
[0,0,7,0,0,0,6,0,0,0,0],
[0,0,0,0,7,0,6,0,0,0,0],
[0,0,0,7,0,0,6,0,0,0,0],
[0,0,0,0,0,0,6,0,0,0,7],
[0,7,0,0,0,0,6,0,0,0,0],
[0,0,0,0,0,0,6,0,0,7,0],
[6,6,6,6,6,6,12,6,6,6,6]
]*Z(13);