This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Working with arrays of arrays can be confusing, requiring extrapolating simple ideas you probably already know into more complex ones in ways you might not think of or realize are possible. For that reason, I put together a short runnable example that should answer most of your questions. Please ask if you have more.