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The population of Hietzing is 51,120.
The area of Hietzing is 37.7 square kilometers.
Schule = school
Ich bin in der Schule. Auf Wiedersehen. = I'm at school. Goodbye.
in der Schule - at school, also in the school
less common (more likely if you give the name of a specific school)
an der Schule - at school
auf der Schule - at school
Schule