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;; not sure whether this is an improvement but I don't really like letfn | |
(defn keep-only | |
[n bucket-fn s] | |
((fn my-filter | |
[s seen] | |
(lazy-seq | |
(when (seq s) | |
(let [e (first s) | |
b (bucket-fn e) | |
c (inc (get seen b 0))] |
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