Awesome site! Having done a few Clojure projects lately, I got most of these right immediately, but there were a few I messed up. It would be cool if you could

Awesome site! Having done a few Clojure projects lately, I got most of these right immediately, but there were a few I messed up. It would be cool if you could go through these flashcard-style: one try for each koan in a category, then re-show the ones you got wrong, and repeat until you get them all right.