On Dec 16, 2006, at 4:39 AM, Just Maz wrote:

> hobbies being the list of hobbies of one person
> and persons_hobbies being...list of people who have hobbies???

hobbies looks like:  {"football" => ["Kevin", "John"], ...}
persons_hobbies looks like:  {"John" => ["football", "karate"], ...}

Others have shown how to do it with just one data structure and some  
iteration though.

James Edward Gray II