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"Hello, World!"

To start your Flutter app, pass in an instance of your app to
the runApp function.

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App is a widget. The build method describes the part of the
user interface it represents.
It’s common to begin your app with a WidgetApp class,
like CupertinoApp.

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The widget used in HomePage might begin with the Scaffold class.
Scaffold implements a basic layout structure for an app.

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