Question: How to simplify element in FPG?

1. Take a group for example. First we can set up a group G by

G:=<<a,b>|<a2=1,b3=1,(a.b)2=1>>. Actually,G=S3. So how to simplify a long production,

such as "a.b.b.a.b.b.a.b"?

2. How to define a finitely presented algebra over some field, such as the enveloping algebra

or quantum group of a Lie algebra? And moreover how to do the similar computation about 

simplifying a long production?

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