(defn seq-to-multimap
"takes a sequence s of possibly repeating elements
and converts it to a map, where keys are obtained by applying key-
fn
to elements of s and values are sequence of all elements of s with
the particular key"
[s key-fn]
(apply merge-with concat
(map (fn [x] {(key-fn x) [x]}) s)))
Here's a more concise, but probably significantly slower version ....
-Jason
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