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Hi,

I have the following problem: I have a semigroup H inside a free group G.

G is of finite rank but clearly infinite. H is given by some generators,

but they could be redundant or have some relations. I would like to know

the relations between these generators in the semigroup H, or at least to

know which generators are necessary to get H. Is this possible in some

way?

Thank you very much,

Cinzia

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