File talk:Beispiel für einfache Baumstruktur.jpg
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Mistake[edit]
A sister of an X' projection is *not* called a complement. --84.151.172.64 15:59, 5 January 2019 (UTC)
A sister of an X' projection is *not* called a complement. --84.151.172.64 15:59, 5 January 2019 (UTC)[reply]