From: Martin DeMello <martindemello@...>
Date: 2009-11-05T00:59:49+09:00
Subject: Re: Odd : a = Hash.new(Hash.new)

Also, see this if you want autovivification all the way down:

http://t-a-w.blogspot.com/2006/07/autovivification-in-ruby.html

martin