clojure collections

user=> (class '(1 2 3))
clojure.lang.PersistentList
user=> (class [1 2 3])
clojure.lang.PersistentVector
user=> (class #{:the :brown :fox})
clojure.lang.PersistentHashSet
user=> (class {:first-name "chris" :last-name "he"})
clojure.lang.PersistentArrayMap

user=> (class (sorted-set #{:the :quick :brown :fox}))
clojure.lang.PersistentTreeSet

user=> (class (sorted-map :a 1 :b 2 :c 3))
clojure.lang.PersistentTreeMap