Henry,
Look at the listing's of the traditional VAs on the performance page starting with Global and ending with the REA. Count backwards from the REA and that gives you the last digit for the pseudo numbers. Since the REA is tc_1009, the MM should be tc_1008, and so forth until you get to the first VA listed, Global which will be tc_1001.
I was not the originator of this; it came from someone else but that is lost in time. I trust it still works.
Ray