If you were feeling so inclined, you could structure this as a lazy sequence
(like 'partition' does)
(defn lazy-break
[coll]
(letfn [(break-paired [pairs]
(lazy-seq
(when-let [s (seq pairs)]
(let [p (doall (take-while (fn [[a b]] (= (inc a) b)) pairs))
cutpoint (count p)]
(cons (concat p [(nth pairs cutpoint)])
(break-paired (drop (inc cutpoint) pairs)))))))]
(map #(map first %) (break-paired (map vector coll (rest coll))))))
user> (take 2 (lazy-break (concat (range 4) (range 3) (range))))
((0 1 2 3) (0 1 2))
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