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This film, being German, inherits the - "duzen" and "Siezen" - of the German language and social custom. Translating it into English is problematic.
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When student Jenny is at Frau Krüger's (b. 1926) home, a picture of Ludwig van Beethoven (1770-1827) and one of Wilhelm Furtwängler (1886-1954) can be seen on the wall above the piano. Earlier, we see a picture of Furtwängler when the young Krüger is being coerced by a member of the Nazi party to rebuke her friendship with her then student (circa 1944).