file taken from http://cdn.cognitect.com/stateofclojure/2014/clj-feature.txt
$ cat /tmp/clj-feature.txt | grep -v '^$' | sort | uniq -c | sort -nr | head 10 "feature expressions" 7 "Types" 5 "pattern matching" 5 "fast startup" 5 "Feature expressions" 4 "debugger"