Some solutions for n=7
..0..4..5....0..4..5....0..4..5....1..3..5....2..6..1....6..3..0....4..5..0
..5..1..3....6..2..1....5..0..4....5..2..2....1..4..4....0..4..5....0..6..3
..3..0..6....2..3..4....4..2..3....2..1..6....4..5..0....5..0..4....3..0..6
..6..2..1....5..4..0....3..5..1....6..0..3....0..3..6....4..2..3....6..1..2
..1..6..2....1..3..5....1..6..2....3..6..0....6..0..3....3..5..1....2..2..5
..2..3..4....6..3..0....2..1..6....0..5..4....3..1..5....1..6..2....5..3..1
..4..5..0....1..2..6....6..3..0....4..4..1....5..2..2....2..1..6....1..4..4
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