From the comment:

"A simple 2D-Array implementation.

Neither storing nor sorting (otherwise inherited from 
ArrayedCollection) will work. Neither comparing nor most accessing 
mehods inherited from Sequenceable collection will work.  Actually, 
it's a bad idea to inherit this class from collection at all!"

:)

It could be cool to have a clean version called 2dMatrix...


Dr. Stéphane DUCASSE (ducasse at iam.unibe.ch) 
http://www.iam.unibe.ch/~ducasse/
  "if you knew today was your last day on earth, what would you do
  different? ... especially if, by doing something different, today
  might not be your last day on earth" Calvin&Hobbes