What is your favorite prolog task?
I know that prolog is a wonderful language for many kind of tasks. Solving sudoku or [einsten task][1] is fun using prolog. What other interesting tasks for prolog you know?  
I'm building website where people can try and "taste" different languages. Now I'm adding prolog and need tasks that can excite people about prolog.


  [1]: http://home.comcast.net/~virgins/0703_Einstein_task.htm
What is your favorite prolog task?
===

I know that prolog is a wonderful language for many kind of tasks. Solving sudoku or [einsten task][1] is fun using prolog. What other interesting tasks for prolog you know?  
I'm building website where people can try and "taste" different languages. Now I'm adding prolog and need tasks that can excite people about prolog.


  [1]: http://home.comcast.net/~virgins/0703_Einstein_task.htm