anchor.diff:    }
   }
   
  -Card mycard(BuildContext context) {
  -  return 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: () {/* ... */},
  -            ),
  -          ],
  -        ),
  -      ],
  +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: () {/* ... */},
  +              ),
  +            ],
  +          ),
  +        ],
  +      ),
       ),
     );
   }
  
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:                 ],
                ),
                mycard(context),
                Row(children: [mycard(context), mycard(context)]),
                Row(children: [
                  mycard(context),
                  mycard(context),
                  mycard(context)
                ]),
              ],
            ),
          ),
  