File:Henryk Stefan Janko (1807-1887).jpg
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![File:Henryk Stefan Janko (1807-1887).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/4/4d/Henryk_Stefan_Janko_%281807-1887%29.jpg/383px-Henryk_Stefan_Janko_%281807-1887%29.jpg?20130414150032)
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