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For questions concerning groups defined via a presentation by generators and relations.

A group has the presentation $\langle S \mid R \rangle$ if it is isomorphic to the quotient of the free group on $S$ by the normal subgroup generated by $R$. This tag is used for questions about specific group presentations, for example $$\langle a,b | a=b^2=(ab)^4\rangle.$$

Use this tag for questions about the isomorphism class, order, characteristic subgroups, or other information about a group defined by a specific presentation.

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