I agree with Ryan and Victor, except that you don't need presentations. The subgroup is generated by , so you can write
If you apply the relators , you get ; then if you apply the relators , you get ; then finally if you apply , you get . You can add this as an extra half-paragraph or footnote rather than giving a citation.
I don't think that the referee has the right to demand a longer explanation than this, unless maybe you are writing a textbook.
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