In general, this function will work for non-integer collections. I
make no performance/laziness guarantees.
(defn selections-dups [coll n]
(let [r (range (count coll))
f #(< (last %1) (first %1))
s (remove f (selections r n))]
(map #(map (fn [x] (nth coll x)) %1) s)))
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