My pleasure! ^_^ And I agree that narrowing it down is a wise move! There’s WAY too much to cover all in one essay otherwise.
And I love the idea of 3 x 3 comparisons. It has some very nice symmetry. ^_^ (Math geek. ^_~) I wish you the best of luck with it and I’ll be happy to talk to you about it again any time you’d like. ^_^