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							- from typing import Optional
 - 
 - from pydantic import BaseModel
 - 
 - 
 - class PreviewDetail(BaseModel):
 -     content: str
 -     child_chunks: Optional[list[str]] = None
 - 
 - 
 - class QAPreviewDetail(BaseModel):
 -     question: str
 -     answer: str
 - 
 - 
 - class IndexingEstimate(BaseModel):
 -     total_segments: int
 -     preview: list[PreviewDetail]
 -     qa_preview: Optional[list[QAPreviewDetail]] = None
 
 
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