[JPs]

hmmmm.........
I have only followed Homer's reccomended reading of the book twice and lurked on every TGM forum known for 3 months so there is still a lot of fog for me, but in my limited knowledge I would guess Rhythm.

3 of 4 listed are Essentials. Does the order of Essentials & Imperatives mean anything?

Rhythm is the last essential, two lines above the imperative list? It was close to the Imperative list, maybe it was to be thought of as the last Essential and the first Imperative?

Also Rhythm is mentioned more times than I can keep track of:
2-0, 3-0, 6-B-3-0, 7-10, 7-12(index)... i'm sure there are more but I cant remember.

Just one man's uneducated fog shrouded guess.

-JP