Levin, Discrete Mathematics: An Open Introduction (3rd ed.), §5.3 Planar Graphs, Exercise 12
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Exercise 12
Avg difficulty 2.5Adapted from Discrete Mathematics: An Open Introduction © 2013–2019 Oscar Levin. Licensed under CC BY-SA 4.0. Source: Discrete Mathematics: An Open Introduction. Imported at revision 1e2e26b.