Some solutions for 3X7
..0..0..2..0..2..0..2....0..0..0..0..0..0..0....0..0..1..0..1..0..1
..2..0..0..0..0..0..0....1..0..2..0..2..1..1....0..0..0..0..1..1..0
..0..0..2..0..2..1..2....0..0..0..0..0..0..1....1..0..0..1..0..0..1
...
...2..2..2..2..2..2.......1..2..2..2..3..2.......0..1..1..2..3..2...
...2..2..2..2..3..3.......1..2..2..2..3..3.......1..0..1..2..2..2...
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