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A computer program can modify itself but it cannot violate its own instructions — it can at best change some parts of itself by *obeying* its own instructions.

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Don't use a five-dollar word when a fifty-cent word will do.

When copywriters argue with me about some esoteric word they want to use, I say to them, ‘Get on a bus. Go to Iowa. Stay on a farm for a week and talk to the farmer. Come back to New York by train and talk to your fellow passengers in the day-coach. If you still want to use the word, go ahead.

The most important word in the vocabulary of advertising is TEST. Test your premise. Test your media. Test your headlines and your illustrations. Test the size of your advertisements. Test your frequency. Test your level of expenditure. Test your commercials. Never stop testing, and your advertising will never stop improving.

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