anchor.diff:                  ],
                 ),
                 mycard(context),
  -              ConstrainedBox(
  -                  constraints: BoxConstraints(maxWidth: 800, maxHeight: 400),
  -                  child: gridView),
  +              Row(children: [mycard(context), mycard(context)]),
  +              Row(children: [
  +                mycard(context),
  +                mycard(context),
  +                mycard(context)
  +              ]),
               ],
             ),
           ),
  
positive.code:         body: Text("loading..."),
        );
      }
  
      var gridView = GridView.count(
          primary: false,
          padding: const EdgeInsets.all(20),
          crossAxisSpacing: 10,
          mainAxisSpacing: 10,
          crossAxisCount: 2,
          children: <Widget>[
            mycard(context),
            mycard(context),
            mycard(context),
            mycard(context),
            mycard(context)
          ]);
  
      return Scaffold(
        appBar: AppBar(
  
negative.code:   }
  }
  
  Expanded mycard(BuildContext context) {
    return Expanded(
      child: Card(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
            const ListTile(
              leading: Icon(Icons.album),
              title: Text('The Enchanted Nightingale'),
              subtitle: Text('Music by Julie Gable. Lyrics by Sidney Stein.'),
            ),
            ButtonBar(
              children: <Widget>[
                FlatButton(
                  child: const Text('BUY TICKETS'),
                  onPressed: () {/* ... */},
                ),
                FlatButton(
                  child: const Text('LISTEN'),
                  onPressed: () {/* ... */},
                ),
              ],
            ),
          ],
        ),
      ),
    );
  }
  