gistfile1.clj

(defn remove-dupes [coll]
  (loop [out [], coll coll]
    (if-let [coll (seq coll)]
      (let [x (first coll)
            xs (rest coll)]
        (recur (if (some #{x} out)
                 out
                 (conj out x))
               xs))
      out)))