Some solutions for 3X7
..0..1..1..1..0..0..0....0..0..0..0..0..0..1....0..1..1..1..0..0..0
..1..0..0..1..1..1..1....1..1..0..1..1..1..0....0..0..1..0..0..1..1
..1..0..0..0..0..0..0....0..0..1..0..1..1..0....1..0..1..1..1..0..1
...
...E..E..P..P..E..E.......E..M..M..E..E..E.......M..P..P..M..M..E...
...E..M..M..E..E..E.......E..E..E..P..P..E.......M..E..P..E..E..P...
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