Database.dart
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			import 'package:firebase_database/firebase_database.dart';
			import 'package:Teacher_Dashboard/model/Class.dart';
			import 'package:Teacher_Dashboard/model/Group.dart';
			import 'dart:async';

			final dbRef = FirebaseDatabase.instance.reference().child("Groups");
			StreamSubscription<Event> _onTodoAddedSubscription;
			StreamSubscription<Event> _onTodoChangedSubscription;

			//Query _todoQuery;

R10646/Dashboard/lib/Database.dartb9abda7aee89master