(frequencies ["a" "a" "b" "c" "d" "d"]) # => @{"c" 1 "d" 2 "a" 2 "b" 1} (frequencies {:a "Bob" :b "Joe" :c "Mat" :d "Bob"}) # => @{"Bob" 2 "Joe" 1 "Mat" 1} (frequencies "Hallo World") # => @{108 3 114 1 100 1 87 1 97 1 32 1 111 2 72 1}