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*Starting with arb files in lib/l10n, the tool creates the following by default: 1. An AppLocalizations class containing: - an `AppLocalizationsDelegate` - a `supportedLocales` property that returns a list of all supported locales. - a `localizationsDelegate` property that returns a list containing this delegate along with `GlobalMaterialLocalizations.delegate`, `GlobalCupertinoLocalizations.delegate`, and `GlobalWidgetsLocalizations.delegate`. 2. One Dart `message_<locale>.dart` file for each arb file, as well as a `messages_all.dart` file that performs the locale message lookup. The tool infers the locale of each arb file from the @@Locale property or the arb file's name.