If you study the history of the alphabet, the letters came from egyptian heiroglyphs such
A door = Dalet = D
A house = Bet = B
An ox head = Alpha = A

and so on....

Heres another hint...the reason those things were chosen were not arbitrary...and not even because the objects depicted started with the sounds of those letters...

It has to do with interdimensional conectivity in the letter matrix and how they related to each other...

A house, a door, a gardin, a manicle, a court yard etc.

Think of the perimeter of the chart as its House...or the outer shell of the big dot.

Ok, thats enought clues on that one...the rest you'll have to figure out on your own.