Some solutions with a(1,1)=0 for 4X10
..0..2..2..1..0..2..0..0..2..1....0..2..2..0..1..2..0..2..1..0
..0..0..2..0..2..1..1..1..2..0....0..0..1..0..2..2..1..1..2..0
..1..1..1..0..1..2..0..2..1..0....1..1..2..1..0..1..0..0..2..1
..0..2..2..1..0..2..0..0..2..1....0..2..2..0..1..2..0..2..1..0
|