> **Puzzles 159.** The categories I've been calling \\(\mathcal{C}\\) and \\(\mathcal{D}\\) have other, more purely mathematical names. More precisely, they are _isomorphic_ to two other categories we've already seen in this course, which have more mathematical names. What are those other categories?

I think \\(\mathcal{C}\\) has been called "\\(\mathbf{2}\\)" in other discussions and \\(\mathcal{D}\\) has been called "\\(\mathbf{1}\\)".