Fixed trials within randomized (BGR) blocks?

[jarvis24]

Want to be sure I understand the basic problem here. The way I read it, the trouble is having blocks randomized but keeping a set of fixed intros, where one precedes each of the trials within the randomized blocks. E.g., Say I wanted to show a block of 5 letters and a block of 5 numbers, randomizing the order of those two blocks and maybe even the trials within those blocks. That's usually no problem--the catch here is that I want to show "trial 1" before the first trial, no matter whether it's a number or a letter. Then "trial 2", "trial 3" and so on. Is this the problem? If so, I've attached a test input file for you to check out that addresses this at the most basic level. Take a look and see what think.
-Blair