o o o o o o o o o o o  x . x x x . x x . x x . . . . x x x x x x . . . . x x . . x . . . . x x . . . . . . . . . . . x . . x . . x . . x . |
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X o o o o o o o o o o  x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x . x x . . x x x x x x . x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x . . x x . . . x . . x . . x x x x x x . . x x x . x . . . . . . . x . x x x . x |
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X o o o o o o o o o o  . . . . . . . x . . . . . x x x . x x x x x x x . . . x x x x x |
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X o o o o o o o o o o  . x x x . x x x x x x x . . x x . x x x x |
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X o o o o o o o o o o  x x . . . x . x . x x x x x x x x x x x x x x x x . x . . . x x x x x x x x . x x x x x x x x x x x x . . . . . x x x x . x x . x x x x |
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X o o o o o o o o o o  x x |
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