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     "label": "Obstruction - Submerged                                     ",
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     "label": "Obstruction - Visible at high water                         ",
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     "value": "Rock - Awash                                                ",
     "label": "Rock - Awash                                                ",
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     "value": "Not Charted                                                 ",
     "label": "Not Charted                                                 ",
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