Those are all commutators of the form X Y X' Y'

> R2 E2 R2 E2
X=R2
Y=E2

> R2 E R2 E'
X=R2
Y=E

> R2 U2 R2 U2
X=R2
Y=U2

The key is that for most of them they are their own inverses.  This 
is one key to making quick easy commutators.

Hope this helps some,
Chris

--- In [email protected], "undermostfiend" 
<[EMAIL PROTECTED]> wrote:
>
> R2 E2 R2 E2
> 
> R2 E R2 E'
> 
> R2 U2 R2 U2
> 
> i found these out when i was fooling around
>






 
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