On Nov 10, 10:28 pm, David Jacobs <develo...@allthingsprogress.com>
wrote:
> I have a sorted list, and I'd like to derive from that a list
> containing all "ties" in the original.

One more solution assuming input is sorted:

(defn seq-ties [coll]
  (mapcat #(cons (first %) %) (keep next (partition-by identity
coll))))

--
Juha Arpiainen

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