x = [
0 0 0 0 0 0 0 0 0;
0 0 1 1 1 1 1 0 0;
0 1 0 0 0 0 0 1 0;
0 1 0 1 0 1 0 1 0;
0 1 0 0 0 0 0 1 0;
0 1 1 0 0 0 1 1 0;
0 1 0 1 1 1 0 1 0;
0 1 0 0 0 0 0 1 0;
0 0 1 1 1 1 1 0 0;
0 0 0 0 0 0 0 0 0 ];
