Some solutions for 3X7
..0..1..1..1..2..2..2....0..2..2..2..2..2..2....0..1..1..1..1..2..2
..1..1..1..2..1..1..1....2..1..1..1..1..1..1....1..0..0..1..1..0..0
..2..0..2..0..2..2..2....2..1..2..2..2..2..2....1..1..2..1..1..2..2
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...3..4..5..6..6..6.......5..6..6..6..6..6.......2..2..3..4..4..4...
...4..4..5..5..6..6.......6..5..6..6..6..6.......3..3..4..4..4..4...
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