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Does a de Bruijn sequence exist for every length of rhyming pattern? Does every de Bruijn sequence form a cycle? How many universal poems are there of a given length?

Clare (like gare) is a Chalkdust editor. In her spare time, she’s an assistant professor at Durham University. She likes Skittles, probability, and making the magazine look more like Cosmo.

Chalkdust dissertation prize 2025
Calling all final-year students! This is your opportunity to get your work published as a Chalkdust article.
Chalkdust dissertation prize
Calling all final-year students!
The big argument: What’s the best way to end a proof?
QED or $\square$?
Bells, braids and taxicabs
An adventure that starts with a morning of bell ringing and ends with a mad dash in a taxi
What’s your least favourite number?
Read about our least favourite numbers in this collection from issue 5!
What should you get a mathematician for Christmas?
Behind today's door... The Chalkdust guide to Christmas presents