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Jan 23, 2021 at 16:12 comment added M. Winter Thank you very much. The suggestions of Sylvain are interesting, but this answer is absolutely sufficient for my purpose and I am happy to accept it.
Jan 23, 2021 at 16:10 vote accept M. Winter
Jan 23, 2021 at 15:33 comment added Sylvain JULIEN So maybe an additional hypothesis of topogical nature (like planarity, genus $0$ or whatever) should be required to ensure an affirmative answer.
Jan 23, 2021 at 15:18 history answered Sam Hopkins CC BY-SA 4.0