matrix field=25 rows=12 cols=12
  0  0  1  0  0  0  0  0  0  0  0  0
  2  4  4  0  0  0  0  0  0  0  0  0
  3  4  1  0  0  0  0  0  0  0  0  0
  0  0  0  0  1  0  0  0  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  1  0  0  0  0  0  0  0  0
  0  0  0  0  0  0  0  0  0  0  1  0
  0 10 20  5 18 11  7 12  1  0  7  0
  2  0  3  2  2  1  1  4  0  1  0  0
  0  0  0  0  0  1  0  0  0  0  0  0
 24 13  2  6  1 24 23 14  0  0 22  1