{
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  "layers" : [
    {
      "name" : "TrafficSignals", 
      "serviceItemId" : "d67c77b9e4b6477facd543f75ee8504f", 
      "url" : "https://services2.arcgis.com/cHGEnmsJ165IBJRM/ArcGIS/rest/services/WebEocFeatureLayerPRD/FeatureServer/3"
    }
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}