Wow, thanks for the quick replies, guys :) I can't decide which one I
like best.

On Nov 10, 3:40 pm, Ken Wesson <kwess...@gmail.com> wrote:
> And
>
> (let [x (map #(if (= %1 %2) [%1]) s (rest s))]
>   (mapcat #(if (nil? %1) %2 %1) x (concat (rest x) [nil])))
>
> does it lazily. :)

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