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Jul 26 at 15:05 vote accept Felix Schröder
Jul 6, 2022 at 23:47 comment added Sam Hopkins See also my answer to a previous MO question: mathoverflow.net/a/281544/25028. As stated there, I believe the first explicit construction is due to Lovász.
Jun 21, 2022 at 12:34 history answered Tony Huynh CC BY-SA 4.0