1.
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Flashes
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Great danger - all ships should stop or deviate according instructions
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2.
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Constant light or occulting
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Forbidden passage
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2a.
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Constant light or occulting
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Forbidden passage, except for ships sailing out of main channel and for ships onto which main message does not relate
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3.
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Constant light or occulting
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Passage permited. One way traffic
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4.
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Constant light or occulting
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Passage permited. Two way traffic
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5.
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Constant light or occulting
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Passage permited only with special permition
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5a.
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Constant light or occulting
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Passage permited only with special permition, except for ships sailing out of main channel and for ships onto which main message does not relate
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