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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 __realized_bbox(self, requested_bbox):
 """ The requested bbox might not be aligned to the underlying chunk grid or even outside the bounds of the dataset. Convert the request into a bbox representing something that can be actually downloaded. Returns: Bbox """

    realized_bbox = requested_bbox.expand_to_chunk_size(self.underlying, offset=self.voxel_offset)
    return Bbox.clamp(realized_bbox, self.bounds)