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There is an old saying, ”No matter how big a net one may spread, each bird is caught in a single hole.”
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While on a tour of the country, Marquis Wen of the state of Wei saw a man wearing a fur with the hide outside, carrying a bundle of straw.
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A certain country was invaded by its enemy. When a lame man there told a blind man of this, the blind man carried the lame one on his back and they escaped together.