I read the fine manual regarding mechsim, but couldn't find an
obvious way to do what I want to do.  Is there a way to specify *which*
groups to collide?  Using collision type 2, it will only test for
collisions between elements of different groups, but this still means a
lot of collisions when there are a fair amount of groups.
   This may be a little bit confusing, but the basic setup is a lot of
layers of spheres - like below only in three dimensions.  The only
relevant collisions are between the different groups A-E, but I don't
want it to test A-B, A-C, A-D, A-E, B-C, etc...  All that is necessary
is the collision between adjacent groups.  Hope I made myself clear. 
Thanks in advance.

A B C D E
* * * * *
* * * * *
* * * * *
* * * * *
* * * * *

 - Ricky

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