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Dear Dirichlet, Issue 18
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Coffee, Brexit and badgers are among the topics of discussion in this issue's Dear Dirichlet advice columnSolutions to recent puzzles
Looking back at puzzles about complex numbers, tic-tac-toe, and the Eggnog MysteryHow to make: a Möbius Surprise
Surprise yourself by making this thingSolution to Christmas conundrum #4
... and the winnersOptimal Pac-Man
Matthew Scroggs spends too much time beating this arcade classic.