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{
   "goal": "minimize",
   "objective_function": {
      "operation": "sum",
      "operands": [
         {
            "function": "distance_between",
            "weight": 1.0,
            "params": {
               "demand": "vG",
               "location": "customer_loc"      
            } 
         },
         {
 	        "function": "distance_between",
            "weight": 1.0,
            "params": {
               "demand": "vFW",
               "location": "customer_loc"      
            } 
         }
      ]
   }
}