https://en.wikipedia.org/wiki/Earth%E2%80%93Moon_problem
Feb 7, 9:29pm: How many colors are needed to colour biplanar graphs? → How many colours are needed to colour biplanar graphs?
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https://en.wikipedia.org/wiki/Earth%E2%80%93Moon_problem
Feb 7, 9:29pm: How many colors are needed to colour biplanar graphs? → How many colours are needed to colour biplanar graphs?