Write down all the morphisms in the category D.

![diagram](https://docs.google.com/drawings/d/e/2PACX-1vTgg62cGaO9uKDrPx0v3uVGwtununqXr0DLEec3eI8YrwbTiLFhHOuQW6TQkBWZuMjL7osQMh8hN31w/pub?w=217&h=261)

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