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class Color:
    __match_args__ = ("r", "g", "b")

    def __init__(self, r: int, g: int, b: int) -> None:
        self.r, self.g, self.b = r, g, b


def describe(c: Color) -> str:
    match c:
        case Color(0, 0, 0):
            return "black"
        case Color(255, 255, 255):
            return "white"
        case Color(r, g, b) if r == g == b:
            return f"gray({r})"
        case Color(r, 0, 0):
            return f"red-only({r})"
        case Color(r, g, b):
            return f"rgb({r},{g},{b})"
    return "unreachable"


print(describe(Color(0, 0, 0)))
print(describe(Color(255, 255, 255)))
print(describe(Color(50, 50, 50)))
print(describe(Color(200, 0, 0)))
print(describe(Color(10, 20, 30)))

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