Fill Tree

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from dataclasses import dataclass

@dataclass
class Corgi:
    name: str
    height: int
    coat_color: str

@dataclass
class Tree:
    pass

EMPTY = Tree()

@dataclass
class FamilyTree(Tree):
    corgi: Corgi
    mother: Tree
    father: Tree

def stack_yellow_corgis(family: Tree) -> int:
    if ___ == ___:
        return ___
    mother_height_total = ___(___.___)
    father_height_total = ___(___.___)
    total_height_from_parents = ___ + ___
    if ___.___.___ == "___":
        return total_height_from_parents + ___.___.___
    else:
        return total_height_from_parents

ada = Corgi("Ada", 20, "yellow")
grace = Corgi("Grace", 30, "yellow")
alan = Corgi("Alan", 25, "yellow")
don = Corgi("Don", 15, "mixed")