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## Comments

1) No, there are no inverses for non-identity morphisms.

2) \(\mathcal{C}\): Yes, \(s^{-1}=s,\mathrm{id}_z^{-1}=\mathrm{id}_z\). \(\mathcal{D}\): No, there are no inverses for non-identity morphisms.

`1) No, there are no inverses for non-identity morphisms. 2) \\(\mathcal{C}\\): Yes, \\(s^{-1}=s,\mathrm{id}_z^{-1}=\mathrm{id}_z\\). \\(\mathcal{D}\\): No, there are no inverses for non-identity morphisms.`