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thank you, maybe I should not use the word "block", I should say pattern. like the text file I have given in the first post, the first line starts with a symbol "@", and the third line starts with "+",the other part are identical, but not identical in other four-lines. the even lines are of the same length in the whole text file. the whole file follow this pattern. I am a newbie. sorry for my careless. In reply to Re^2: index for large text file
by cafeblue
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