nested lists (to combine conditions)

[Tobias]

Dear all,

I have an experiment with a list of 1024 lines that define certain 
conditions.

There is an extra variable (64 different values) which is not exactly 
task-relevant and that I can't combine with all 1024 combinations of other 
things because it would blow up the experiment to 10,000s of trials.

So my idea was to combine all 8 crucial conditions (each of the 8 crucial 
conditions consists of 128 combinations of other stuff, thus summing up to 
8x128=1024 trials) with the 64 values of the extra variable.

What I did is as follows: I created 8 nested lists which are identical 
(apart from their name obviously) and consist the 64 values of that other 
variable. Thus all 64 values of that variable are equally often assigned to 
one of the 8 crucial conditions (i.e. twice each), but not equally often to 
all 1024 conditions.

It is quite unhandy to have all those lists and I can imagine that one 
might have even more variables he/she wants to control for an extra 
variable. So my question is: Is there an easier way of doing this?

Thanks for any help!
Tobias

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