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update nested map in clojure.
(def divisions
{:division1
{:group1 [:staff1 :staff2]
:group2 [:staff3 :staff4 :staff5]}
:division2
{:group3 [:staff6 :staff7]}})
(reduce
(fn [ds [d g staffs]]
(assoc-in ds [d g] (remove #{:staff2} staffs)))
divisions
(for [[d groups] divisions
[g staffs] groups]
[d g staffs]))
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