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   "layerName": "USAPopProject",
   "layerType": "Feature Layer",
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   "maxScale": 0,
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    {
     "label": "Less than 2 Million",
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     "label": "5 - 10 Million",
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     "label": "10 - 20 Million",
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     "groupId": "0",
     "height": 20,
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    {
     "label": "Greater than 20 Million",
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   ],
   "legendGroups": [
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     "heading": "POPULATION"
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}