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[[File:firebase_realtime_database_console.png]]
Figure 20-1
After execution, the data tree as represented within the Firebase console will appear as shown in Figure 20 2:
[[File:firebase_realtime_console_tree_hello.png]]
Figure 20-2
[[File:firebase_realtime_console_tree_goodbye.png]]
Figure 20-3
[[File:firebase_realtime_console_tree_goodbye.png]]
Figure 20-4
