Ordered elements within a Random Order Controller

[Kathy Mitchell]

I have a random order controller with many child elements.  Recently I
have added some groups of children to this controller that need to run
sequentially.  For example, children 1, 2 and 3 need to be run in order.
And the same may be true for children 4, 5 and 6, etc.  However, I don't
care in what order the groups are run.  Either the 1,2,3 or 4,5,6
grouping can run first.  Is there a way to force groups of children
under a random order controller to run sequentially?
 
Thanks,
 
Kathy