Some solutions for 6X4 with a(1,1)=0
..0..0..0..1....0..0..2..2....0..0..0..3....0..0..1..1....0..0..3..3
..0..2..2..1....0..2..2..1....0..2..2..3....0..2..2..1....0..2..2..2
..0..0..2..3....0..0..1..1....0..0..3..0....0..0..1..1....0..0..3..1
..2..0..0..3....2..0..2..2....2..0..3..0....2..0..3..3....2..0..3..1
..2..2..0..0....2..3..3..1....2..2..2..0....2..2..2..2....2..0..2..2
..0..0..2..2....0..0..0..1....0..0..1..1....0..0..1..1....2..2..0..0
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