Question: Non-commutative algebra

Hello all. I want to be able to use Maple to do algebra with variables which do not commute with each other. Is there any way I can do this? Really, all I want to be able to do is specify that X*Y - Y*X != 0, and then have Maple recognise that for more complicated functions of X and Y. I have been looking through the documentation in the help system and have found no clues. Many thanks in advance for your help. Dave Abergel
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