For reference, Clojure's core.logic: https://gist.github.com/rm-hull/6952960 https://gist.github.com/rm-hull/6952960 Or, from Norvig, presumably as an update to

For reference, Clojure's core.logic: https://gist.github.com/rm-hull/6952960 https://gist.github.com/rm-hull/6952960 Or, from Norvig, presumably as an update to the solution he made with Lisp and Prolog, here's a Python version that doesn't use any fancy logic engine: https://gist.github.com/joyrexus/5301901 https://gist.github.com/joyrexus/5301901