If only it was that easy... I also have docs  that I would like 1 & 2
to see, or 2 & 3 or 1 & 3 etc etc (there is a total of 5), so as you
can see it could get quite hairy. One idea I have been looking at
would be to post all docs in one group, then assigning permissions  on
the document  profile... not really secure I know, but do you think
this could be an option?