On an offset press, for example, since the information to be printed is burned onto metal plates, it cannot be altered.

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They supplied us with arrival data for the largest U.S.-based airlines for the last three holiday seasons, which we define as Nov. 20-Dec. 1 for Thanksgiving and Dec. 20-Jan. 6 for the winter holiday. (We examined only arrivals because departure delays can often be offset once a plane is airborne.) The U.S. Department of Transportation also tracks flight information for the holiday season, but FlightStats' list of airlines is more comprehensive.

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And in the developed world, farmers now have access to an explosion of information on the internet, from seed companies, from input suppliers, and others which has helped to offset the shrinking funding for extension services.

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