I think you're mistaken. The Clojure version seems to be derived from the Arc version at http://ycombinator.com/arc/bst.arc http://ycombinator.com/arc/bst.arc,

I think you're mistaken. The Clojure version seems to be derived from the Arc version at http://ycombinator.com/arc/bst.arc http://ycombinator.com/arc/bst.arc, which is turn derived from the corrected Common Lisp version.