Ramesh Reddy While I arranging the books in order, I ran across some old books which I thought that they were might have /had been lost. ( While arranging the books , OR While I was arranging the books ) ( might have been lost OR had been lost )
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Ramesh Reddy While(While arranging the books, OR While I was arranging the books)Iarranging the books in order, I ran across some old books which I thoughtthat they weremight have /had been lost.