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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def from_dict(cls, d):
 """ Returns CompleteDos object from dict representation. """

        tdos = PhononDos.from_dict(d)
        struct = Structure.from_dict(d["structure"])
        pdoss = {}
        for at, pdos in zip(struct, d["pdos"]):
            pdoss[at] = pdos

        return cls(struct, tdos, pdoss)