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Write this accumuator in a functional style

Steve D'Aprano wrote:
> - Greg's dict comprehension version requires N+1 passes through the data, 
>   one to convert to a list, and 1 per each possible key.

Just to be clear, my solution was a response to the requirement
that it be written in a purely functional style. It's not now I
would actually recommend doing it!

While a purely functional single-pass solution is possible,
in Python it would probably be just as inefficient, maybe
even worse.