What is the conjugate of the relator in group representation?

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I need to know this to understand the definition of isoperimetric function.

But is for $abc$ it the $a^{-1}b^{-1}c^{-1}$ or $c^{-1}b^{-1}a^{-1}$ or $cba$? (I think that the first)

P. S. It is not trivial to google this.