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simplifying operator experessions with Dot, Times and Plus


I am trying to expand a large expression that has terms that look as
follows:

-ex[0,1].(ex[0,1].ex[1,2]-ex[1,2].ex[0,1])

where ex[i,j] are unevaluated expressions.  I would like Mathematica to
simplify this and analogous expressions so that they read:

ex[0,1].ex[1,2].ex[0,1]-ex[0,1].ex[0,1].ex[1,2]

However, I cannot seem to find anything that will work.  The problem is that
I need to keep track of the order of the expressions ex[i,j].  If Dot were
replaced by Times, there would be no problem whatsoever.

If anyone knows how to help me with this problem, I would greatly appreciate
it.

Thanks,

Jeremy Levy
jlevy at pitt.edu






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