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   "layerId": 0,
   "layerName": "City population (various years)\t",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
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     "label": "Below 100 000",
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     "groupId": "0",
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     "label": "500 000 - 1 000 000",
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   ],
   "legendGroups": [
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     "heading": "City population"
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}