I'm trying to follow these instructions https://amaranth-lang.org/docs/amaranth/latest/stdlib/enum.html#module-amaranth.lib.enum


```
class ColorScheme(enum.Enum, shape=2):
    BLACK = 0 # No color
    RED = 1   # Pink and orange
    GREEN = 2 # Green and purple
    BLUE = 3  # Blue and black
```