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〈
a
,
b
|
abbaabba
=
a
〉
Monoid presentation of length 9
Properties
Infinite non-commutative monoid
Completion parameters
Reduction order: left-to-right ab
Complete rewriting system
ab
2
a
2
⇒
a
2
b
2
a
a
2
(b
2
a)
2
⇒
a