Let’s make some definitions, based on the pattern in the [previous exercise](https://forum.azimuthproject.org/discussion/2132):

1) What is the category **1**? That is, what are its objects and morphisms?

2) What is the category **0**?

3) What is the formula for the number of morphisms in **n** for arbitrary \\(n \in \mathbb{N} \\) ?

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