More multisets and debugging

Data.Ix and the first use of the RWS monad

Monoids of endomorphisms

Zippers on trees

A very declarative solution

Monads and bit-fiddling

Monads, typeclasses, and lenses return

MultiSet: Mostly useful.

Why did I overload lists by default?

Complicated rules leads to complicated code

A stack-based parser that does just enough

Revelations of the Ix datatype

Brute force trumps cleverness

Gradient descent and higher-order functions

It's all about the data structures

Generalising makes things simpler

Overthinking bingo

Studiously not using a Bits datatype.

Parsers and folds

A warm-up, apart from Cabal

A look back on the event

Avoiding the very deep weeds of number theory