anchor.diff:                      ),
                       Card(
                         child: Container(
  -                        height: 500,
  +                        height: cardHeight,
                           child: ListView.builder(
                               itemCount: thirdList.length,
                               shrinkWrap: true,
  
positive.code:   static List secondList = [];
    static List thirdList = [];
    static List toAdd = [];
   // static List deviceServices = [];
    StreamSubscription<LocationData> _locationSubscription;
    LocationData _currentLocation;
  
negative.code:                     ),
                      Card(
                        child: Container(
                          height: cardHeight,
                          child: ListView.builder(
                              itemCount: secondList.length,
                              shrinkWrap: true,
  